87013391 has 4 divisors (see below), whose sum is σ = 87230784. Its totient is φ = 86796000.

The previous prime is 87013349. The next prime is 87013453. The reversal of 87013391 is 19331078.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87013391 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 (87013691) 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, 108095 + ... + 108896.

It is an arithmetic number, because the mean of its divisors is an integer number (21807696).

Almost surely, 2^87013391 is an apocalyptic number.

87013391 is a deficient number, since it is larger than the sum of its proper divisors (217393).

87013391 is a wasteful number, since it uses less digits than its factorization.

87013391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217392.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 87013391 is about 9328.0968584165. The cubic root of 87013391 is about 443.1274951635.

The spelling of 87013391 in words is "eighty-seven million, thirteen thousand, three hundred ninety-one".