45991591 has 4 divisors (see below), whose sum is σ = 46273912. Its totient is φ = 45709272.

The previous prime is 45991577. The next prime is 45991601. The reversal of 45991591 is 19519954.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 45991591 - 2⁹ = 45991079 is a prime.

It is a super-2 number, since 2×45991591² = 4230452885422562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45991501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140916 + ... + 141241.

It is an arithmetic number, because the mean of its divisors is an integer number (11568478).

Almost surely, 2^45991591 is an apocalyptic number.

45991591 is a deficient number, since it is larger than the sum of its proper divisors (282321).

45991591 is a wasteful number, since it uses less digits than its factorization.

45991591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282320.

The product of its digits is 72900, while the sum is 43.

The square root of 45991591 is about 6781.7100350870. The cubic root of 45991591 is about 358.2829525467.

The spelling of 45991591 in words is "forty-five million, nine hundred ninety-one thousand, five hundred ninety-one".