90991713 has 4 divisors (see below), whose sum is σ = 121322288. Its totient is φ = 60661140.

The previous prime is 90991709. The next prime is 90991721. The reversal of 90991713 is 31719909.

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 not a de Polignac number, because 90991713 - 2² = 90991709 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90991213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15165283 + ... + 15165288.

It is an arithmetic number, because the mean of its divisors is an integer number (30330572).

Almost surely, 2^90991713 is an apocalyptic number.

It is an amenable number.

90991713 is a deficient number, since it is larger than the sum of its proper divisors (30330575).

90991713 is a wasteful number, since it uses less digits than its factorization.

90991713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30330574.

The product of its (nonzero) digits is 15309, while the sum is 39.

The square root of 90991713 is about 9538.9576474581. The cubic root of 90991713 is about 449.7804904718.

The spelling of 90991713 in words is "ninety million, nine hundred ninety-one thousand, seven hundred thirteen".