1264040125 has 8 divisors (see below), whose sum is σ = 1577522232. Its totient is φ = 1011232000.

The previous prime is 1264040123. The next prime is 1264040147. The reversal of 1264040125 is 5210404621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 68194564 + 1195845561 = 8258^2 + 34581^2 .

It is not a de Polignac number, because 1264040125 - 2¹ = 1264040123 is a prime.

It is a super-2 number, since 2×1264040125² = 3195594875220031250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1264040125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264040123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5056036 + ... + 5056285.

It is an arithmetic number, because the mean of its divisors is an integer number (197190279).

Almost surely, 2^1264040125 is an apocalyptic number.

It is an amenable number.

1264040125 is a deficient number, since it is larger than the sum of its proper divisors (313482107).

1264040125 is an equidigital number, since it uses as much as digits as its factorization.

1264040125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10112336 (or 10112326 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1264040125 is about 35553.3419666844. The cubic root of 1264040125 is about 1081.2354759874.

Adding to 1264040125 its reverse (5210404621), we get a palindrome (6474444746).

The spelling of 1264040125 in words is "one billion, two hundred sixty-four million, forty thousand, one hundred twenty-five".