9712521249 has 4 divisors (see below), whose sum is σ = 12950028336. Its totient is φ = 6475014164.

The previous prime is 9712521223. The next prime is 9712521257. The reversal of 9712521249 is 9421252179.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9712521249 - 2¹² = 9712517153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9712521249.

It is not an unprimeable number, because it can be changed into a prime (9712522249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1618753539 + ... + 1618753544.

It is an arithmetic number, because the mean of its divisors is an integer number (3237507084).

Almost surely, 2^9712521249 is an apocalyptic number.

It is an amenable number.

9712521249 is a deficient number, since it is larger than the sum of its proper divisors (3237507087).

9712521249 is a wasteful number, since it uses less digits than its factorization.

9712521249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3237507086.

The product of its digits is 90720, while the sum is 42.

The square root of 9712521249 is about 98552.1245280892. The cubic root of 9712521249 is about 2133.5884941191.

The spelling of 9712521249 in words is "nine billion, seven hundred twelve million, five hundred twenty-one thousand, two hundred forty-nine".