9712521251 has 6 divisors (see below), whose sum is σ = 10250611452. Its totient is φ = 9201335580.

The previous prime is 9712521223. The next prime is 9712521257. The reversal of 9712521251 is 1521252179.

It is not a de Polignac number, because 9712521251 - 2¹⁸ = 9712259107 is a prime.

It is a super-2 number, since 2×9712521251² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9712521257) 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 5 ways as a sum of consecutive naturals, for example, 13451885 + ... + 13452606.

It is an arithmetic number, because the mean of its divisors is an integer number (1708435242).

Almost surely, 2^9712521251 is an apocalyptic number.

9712521251 is a deficient number, since it is larger than the sum of its proper divisors (538090201).

9712521251 is a wasteful number, since it uses less digits than its factorization.

9712521251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26904529 (or 26904510 counting only the distinct ones).

The product of its digits is 12600, while the sum is 35.

The square root of 9712521251 is about 98552.1245382361. The cubic root of 9712521251 is about 2133.5884942655.

The spelling of 9712521251 in words is "nine billion, seven hundred twelve million, five hundred twenty-one thousand, two hundred fifty-one".