91985425 has 36 divisors (see below), whose sum is σ = 133481536. Its totient is φ = 61596000.

The previous prime is 91985363. The next prime is 91985459. The reversal of 91985425 is 52458919.

It is not a de Polignac number, because 91985425 - 2¹⁵ = 91952657 is a prime.

It is a super-2 number, since 2×91985425² = 16922636824861250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 609100 + ... + 609250.

Almost surely, 2^91985425 is an apocalyptic number.

It is an amenable number.

91985425 is a deficient number, since it is larger than the sum of its proper divisors (41496111).

91985425 is a wasteful number, since it uses less digits than its factorization.

91985425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 222 counting only the distinct ones).

The product of its digits is 129600, while the sum is 43.

The square root of 91985425 is about 9590.9032421352. The cubic root of 91985425 is about 451.4119028827.

The spelling of 91985425 in words is "ninety-one million, nine hundred eighty-five thousand, four hundred twenty-five".