45216991 has 8 divisors (see below), whose sum is σ = 47944224. Its totient is φ = 42497280.

The previous prime is 45216949. The next prime is 45217013. The reversal of 45216991 is 19961254.

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

It is not a de Polignac number, because 45216991 - 2⁷ = 45216863 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 45216991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45216911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14806 + ... + 17596.

It is an arithmetic number, because the mean of its divisors is an integer number (5993028).

Almost surely, 2^45216991 is an apocalyptic number.

45216991 is a deficient number, since it is larger than the sum of its proper divisors (2727233).

45216991 is a wasteful number, since it uses less digits than its factorization.

45216991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3761.

The product of its digits is 19440, while the sum is 37.

The square root of 45216991 is about 6724.3580362738. The cubic root of 45216991 is about 356.2601279156.

The spelling of 45216991 in words is "forty-five million, two hundred sixteen thousand, nine hundred ninety-one".