86961815 has 4 divisors (see below), whose sum is σ = 104354184. Its totient is φ = 69569448.

The previous prime is 86961773. The next prime is 86961859. The reversal of 86961815 is 51816968.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 86961815 - 2¹² = 86957719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8696177 + ... + 8696186.

It is an arithmetic number, because the mean of its divisors is an integer number (26088546).

Almost surely, 2^86961815 is an apocalyptic number.

86961815 is a deficient number, since it is larger than the sum of its proper divisors (17392369).

86961815 is a wasteful number, since it uses less digits than its factorization.

86961815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17392368.

The product of its digits is 103680, while the sum is 44.

The square root of 86961815 is about 9325.3318975788. The cubic root of 86961815 is about 443.0399252675.

The spelling of 86961815 in words is "eighty-six million, nine hundred sixty-one thousand, eight hundred fifteen".