90871951 has 4 divisors (see below), whose sum is σ = 91473904. Its totient is φ = 90270000.

The previous prime is 90871931. The next prime is 90871967. The reversal of 90871951 is 15917809.

It is a happy number.

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 90871951 - 2⁹ = 90871439 is a prime.

It is a super-2 number, since 2×90871951² = 16515422957092802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90871931) 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, 300750 + ... + 301051.

It is an arithmetic number, because the mean of its divisors is an integer number (22868476).

Almost surely, 2^90871951 is an apocalyptic number.

90871951 is a deficient number, since it is larger than the sum of its proper divisors (601953).

90871951 is a wasteful number, since it uses less digits than its factorization.

90871951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601952.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 90871951 is about 9532.6780602305. The cubic root of 90871951 is about 449.5830722694.

The spelling of 90871951 in words is "ninety million, eight hundred seventy-one thousand, nine hundred fifty-one".