45637991 has 8 divisors (see below), whose sum is σ = 52202880. Its totient is φ = 39084408.

The previous prime is 45637951. The next prime is 45637993. The reversal of 45637991 is 19973654.

45637991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 45637991 - 2²² = 41443687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45637993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9320 + ... + 13346.

It is an arithmetic number, because the mean of its divisors is an integer number (6525360).

Almost surely, 2^45637991 is an apocalyptic number.

45637991 is a deficient number, since it is larger than the sum of its proper divisors (6564889).

45637991 is a wasteful number, since it uses less digits than its factorization.

45637991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5653.

The product of its digits is 204120, while the sum is 44.

The square root of 45637991 is about 6755.5896115735. The cubic root of 45637991 is about 357.3623862737.

The spelling of 45637991 in words is "forty-five million, six hundred thirty-seven thousand, nine hundred ninety-one".