45444991 has 4 divisors (see below), whose sum is σ = 46673272. Its totient is φ = 44216712.

The previous prime is 45444923. The next prime is 45445003. The reversal of 45444991 is 19944454.

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 45444991 - 2⁷ = 45444863 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 (45444901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 614085 + ... + 614158.

It is an arithmetic number, because the mean of its divisors is an integer number (11668318).

Almost surely, 2^45444991 is an apocalyptic number.

45444991 is a deficient number, since it is larger than the sum of its proper divisors (1228281).

45444991 is a wasteful number, since it uses less digits than its factorization.

45444991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228280.

The product of its digits is 103680, while the sum is 40.

The square root of 45444991 is about 6741.2900100797. The cubic root of 45444991 is about 356.8579206404.

The spelling of 45444991 in words is "forty-five million, four hundred forty-four thousand, nine hundred ninety-one".