91566425 has 6 divisors (see below), whose sum is σ = 113542398. Its totient is φ = 73253120.

The previous prime is 91566383. The next prime is 91566469. The reversal of 91566425 is 52466519.

It can be written as a sum of positive squares in 3 ways, for example, as 4946176 + 86620249 = 2224^2 + 9307^2 .

It is not a de Polignac number, because 91566425 - 2⁸ = 91566169 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1831304 + ... + 1831353.

It is an arithmetic number, because the mean of its divisors is an integer number (18923733).

Almost surely, 2^91566425 is an apocalyptic number.

It is an amenable number.

91566425 is a deficient number, since it is larger than the sum of its proper divisors (21975973).

91566425 is a wasteful number, since it uses less digits than its factorization.

91566425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3662667 (or 3662662 counting only the distinct ones).

The product of its digits is 64800, while the sum is 38.

The square root of 91566425 is about 9569.0346953076. The cubic root of 91566425 is about 450.7254553626.

The spelling of 91566425 in words is "ninety-one million, five hundred sixty-six thousand, four hundred twenty-five".