1252626521 has 8 divisors (see below), whose sum is σ = 1348054344. Its totient is φ = 1159614720.

The previous prime is 1252626511. The next prime is 1252626523. The reversal of 1252626521 is 1256262521.

It can be written as a sum of positive squares in 4 ways, for example, as 164352400 + 1088274121 = 12820^2 + 32989^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1252626521 is a prime.

It is a super-2 number, since 2×1252626521² = 3138146402225126882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1252626523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 602930 + ... + 605003.

It is an arithmetic number, because the mean of its divisors is an integer number (168506793).

Almost surely, 2^1252626521 is an apocalyptic number.

It is an amenable number.

1252626521 is a deficient number, since it is larger than the sum of its proper divisors (95427823).

1252626521 is a wasteful number, since it uses less digits than its factorization.

1252626521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208011.

The product of its digits is 14400, while the sum is 32.

The square root of 1252626521 is about 35392.4641837779. The cubic root of 1252626521 is about 1077.9713062445.

The spelling of 1252626521 in words is "one billion, two hundred fifty-two million, six hundred twenty-six thousand, five hundred twenty-one".