1290857525 has 6 divisors (see below), whose sum is σ = 1600663362. Its totient is φ = 1032686000.

The previous prime is 1290857509. The next prime is 1290857527. The reversal of 1290857525 is 5257580921.

It can be written as a sum of positive squares in 3 ways, for example, as 132204004 + 1158653521 = 11498^2 + 34039^2 .

It is not a de Polignac number, because 1290857525 - 2⁴ = 1290857509 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 (1290857527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25817126 + ... + 25817175.

It is an arithmetic number, because the mean of its divisors is an integer number (266777227).

Almost surely, 2^1290857525 is an apocalyptic number.

It is an amenable number.

1290857525 is a deficient number, since it is larger than the sum of its proper divisors (309805837).

1290857525 is an equidigital number, since it uses as much as digits as its factorization.

1290857525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51634311 (or 51634306 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 44.

The square root of 1290857525 is about 35928.5057440467. The cubic root of 1290857525 is about 1088.8283921088.

The spelling of 1290857525 in words is "one billion, two hundred ninety million, eight hundred fifty-seven thousand, five hundred twenty-five".