87521972058749 has 4 divisors (see below), whose sum is σ = 87522175022880. Its totient is φ = 87521769094620.

The previous prime is 87521972058713. The next prime is 87521972058751. The reversal of 87521972058749 is 94785027912578.

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 a de Polignac number, because none of the positive numbers 2^k-87521972058749 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 (87521972058799) 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, 100833857 + ... + 101698134.

It is an arithmetic number, because the mean of its divisors is an integer number (21880543755720).

Almost surely, 2^{87521972058749} is an apocalyptic number.

It is an amenable number.

87521972058749 is a deficient number, since it is larger than the sum of its proper divisors (202964131).

87521972058749 is a wasteful number, since it uses less digits than its factorization.

87521972058749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202964130.

The product of its (nonzero) digits is 711244800, while the sum is 74.

The spelling of 87521972058749 in words is "eighty-seven trillion, five hundred twenty-one billion, nine hundred seventy-two million, fifty-eight thousand, seven hundred forty-nine".