1211042725 has 12 divisors (see below), whose sum is σ = 1509321924. Its totient is φ = 963912320.

The previous prime is 1211042717. The next prime is 1211042737. The reversal of 1211042725 is 5272401121.

It can be written as a sum of positive squares in 6 ways, for example, as 97752769 + 1113289956 = 9887^2 + 33366^2 .

It is not a de Polignac number, because 1211042725 - 2³ = 1211042717 is a prime.

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 1211042725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118024 + ... + 127873.

It is an arithmetic number, because the mean of its divisors is an integer number (125776827).

Almost surely, 2^1211042725 is an apocalyptic number.

It is an amenable number.

1211042725 is a deficient number, since it is larger than the sum of its proper divisors (298279199).

1211042725 is a wasteful number, since it uses less digits than its factorization.

1211042725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246104 (or 246099 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 1211042725 is about 34800.0391522768. The cubic root of 1211042725 is about 1065.9082453260.

Adding to 1211042725 its reverse (5272401121), we get a palindrome (6483443846).

The spelling of 1211042725 in words is "one billion, two hundred eleven million, forty-two thousand, seven hundred twenty-five".