91400725 has 12 divisors (see below), whose sum is σ = 122055556. Its totient is φ = 67495680.

The previous prime is 91400719. The next prime is 91400737. The reversal of 91400725 is 52700419.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 6355441 + 85045284 = 2521^2 + 9222^2 .

It is not a de Polignac number, because 91400725 - 2³ = 91400717 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91400693 and 91400702.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 140292 + ... + 140941.

Almost surely, 2^91400725 is an apocalyptic number.

It is an amenable number.

91400725 is a deficient number, since it is larger than the sum of its proper divisors (30654831).

91400725 is a wasteful number, since it uses less digits than its factorization.

91400725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281256 (or 281251 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 91400725 is about 9560.3726391810. The cubic root of 91400725 is about 450.4534113108.

The spelling of 91400725 in words is "ninety-one million, four hundred thousand, seven hundred twenty-five".