1263740125 has 8 divisors (see below), whose sum is σ = 1577147832. Its totient is φ = 1010992000.

The previous prime is 1263740123. The next prime is 1263740213. The reversal of 1263740125 is 5210473621.

It can be written as a sum of positive squares in 4 ways, for example, as 181198521 + 1082541604 = 13461^2 + 32902^2 .

It is not a de Polignac number, because 1263740125 - 2¹ = 1263740123 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263740123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5054836 + ... + 5055085.

It is an arithmetic number, because the mean of its divisors is an integer number (197143479).

Almost surely, 2^1263740125 is an apocalyptic number.

It is an amenable number.

1263740125 is a deficient number, since it is larger than the sum of its proper divisors (313407707).

1263740125 is an equidigital number, since it uses as much as digits as its factorization.

1263740125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10109936 (or 10109926 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 1263740125 is about 35549.1227036618. The cubic root of 1263740125 is about 1081.1499311535.

The spelling of 1263740125 in words is "one billion, two hundred sixty-three million, seven hundred forty thousand, one hundred twenty-five".