86961813 has 4 divisors (see below), whose sum is σ = 115949088. Its totient is φ = 57974540.

The previous prime is 86961773. The next prime is 86961859. The reversal of 86961813 is 31816968.

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 86961813 - 2⁸ = 86961557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86961863) 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, 14493633 + ... + 14493638.

It is an arithmetic number, because the mean of its divisors is an integer number (28987272).

Almost surely, 2^86961813 is an apocalyptic number.

It is an amenable number.

86961813 is a deficient number, since it is larger than the sum of its proper divisors (28987275).

86961813 is a wasteful number, since it uses less digits than its factorization.

86961813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28987274.

The product of its digits is 62208, while the sum is 42.

The square root of 86961813 is about 9325.3317903440. The cubic root of 86961813 is about 443.0399218711.

The spelling of 86961813 in words is "eighty-six million, nine hundred sixty-one thousand, eight hundred thirteen".