91641249 has 24 divisors (see below), whose sum is σ = 151536320. Its totient is φ = 52278048.

The previous prime is 91641241. The next prime is 91641257. The reversal of 91641249 is 94214619.

It is a happy number.

91641249 is a `hidden beast` number, since 9 + 1 + 641 + 2 + 4 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (91641241) and next prime (91641257).

It is not a de Polignac number, because 91641249 - 2³ = 91641241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91641241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62082 + ... + 63540.

Almost surely, 2^91641249 is an apocalyptic number.

It is an amenable number.

91641249 is a deficient number, since it is larger than the sum of its proper divisors (59895071).

91641249 is a wasteful number, since it uses less digits than its factorization.

91641249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2469 (or 2466 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 91641249 is about 9572.9435911845. The cubic root of 91641249 is about 450.8481928523.

The spelling of 91641249 in words is "ninety-one million, six hundred forty-one thousand, two hundred forty-nine".