45991491 has 24 divisors (see below), whose sum is σ = 75893760. Its totient is φ = 24257376.

The previous prime is 45991471. The next prime is 45991501. The reversal of 45991491 is 19419954.

It is a happy number.

It is not a de Polignac number, because 45991491 - 2⁹ = 45990979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (45991411) 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, 2931 + ... + 10028.

It is an arithmetic number, because the mean of its divisors is an integer number (3162240).

Almost surely, 2^45991491 is an apocalyptic number.

45991491 is a deficient number, since it is larger than the sum of its proper divisors (29902269).

45991491 is a wasteful number, since it uses less digits than its factorization.

45991491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12995 (or 12982 counting only the distinct ones).

The product of its digits is 58320, while the sum is 42.

The square root of 45991491 is about 6781.7026623113. The cubic root of 45991491 is about 358.2826928738.

The spelling of 45991491 in words is "forty-five million, nine hundred ninety-one thousand, four hundred ninety-one".