86974521 has 4 divisors (see below), whose sum is σ = 115966032. Its totient is φ = 57983012.

The previous prime is 86974519. The next prime is 86974529. The reversal of 86974521 is 12547968.

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 86974521 - 2¹ = 86974519 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (86974529) 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, 14495751 + ... + 14495756.

It is an arithmetic number, because the mean of its divisors is an integer number (28991508).

Almost surely, 2^86974521 is an apocalyptic number.

It is an amenable number.

86974521 is a deficient number, since it is larger than the sum of its proper divisors (28991511).

86974521 is a wasteful number, since it uses less digits than its factorization.

86974521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28991510.

The product of its digits is 120960, while the sum is 42.

The square root of 86974521 is about 9326.0131353114. The cubic root of 86974521 is about 443.0615017535.

The spelling of 86974521 in words is "eighty-six million, nine hundred seventy-four thousand, five hundred twenty-one".