86925821 has 4 divisors (see below), whose sum is σ = 88399200. Its totient is φ = 85452444.

The previous prime is 86925757. The next prime is 86925827. The reversal of 86925821 is 12852968.

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 86925821 - 2⁶ = 86925757 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 (86925827) 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, 736601 + ... + 736718.

It is an arithmetic number, because the mean of its divisors is an integer number (22099800).

Almost surely, 2^86925821 is an apocalyptic number.

It is an amenable number.

86925821 is a deficient number, since it is larger than the sum of its proper divisors (1473379).

86925821 is a wasteful number, since it uses less digits than its factorization.

86925821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473378.

The product of its digits is 69120, while the sum is 41.

The square root of 86925821 is about 9323.4017933370. The cubic root of 86925821 is about 442.9787912333.

The spelling of 86925821 in words is "eighty-six million, nine hundred twenty-five thousand, eight hundred twenty-one".