45917991 has 48 divisors (see below), whose sum is σ = 80458560. Its totient is φ = 24675840.

The previous prime is 45917987. The next prime is 45918017. The reversal of 45917991 is 19971954.

It is not a de Polignac number, because 45917991 - 2² = 45917987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45917941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 74601 + ... + 75213.

It is an arithmetic number, because the mean of its divisors is an integer number (1676220).

Almost surely, 2^45917991 is an apocalyptic number.

45917991 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

45917991 is a deficient number, since it is larger than the sum of its proper divisors (34540569).

45917991 is a wasteful number, since it uses less digits than its factorization.

45917991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696 (or 693 counting only the distinct ones).

The product of its digits is 102060, while the sum is 45.

The square root of 45917991 is about 6776.2815024171. The cubic root of 45917991 is about 358.0917313284.

The spelling of 45917991 in words is "forty-five million, nine hundred seventeen thousand, nine hundred ninety-one".