90871051 has 4 divisors (see below), whose sum is σ = 91271592. Its totient is φ = 90470512.

The previous prime is 90871049. The next prime is 90871061. The reversal of 90871051 is 15017809.

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 90871051 - 2¹ = 90871049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90871021) 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, 199930 + ... + 200383.

It is an arithmetic number, because the mean of its divisors is an integer number (22817898).

Almost surely, 2^90871051 is an apocalyptic number.

90871051 is a deficient number, since it is larger than the sum of its proper divisors (400541).

90871051 is a wasteful number, since it uses less digits than its factorization.

90871051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400540.

The product of its (nonzero) digits is 2520, while the sum is 31.

The square root of 90871051 is about 9532.6308540717. The cubic root of 90871051 is about 449.5815880340.

The spelling of 90871051 in words is "ninety million, eight hundred seventy-one thousand, fifty-one".