45399631 has 4 divisors (see below), whose sum is σ = 47373552. Its totient is φ = 43425712.

The previous prime is 45399623. The next prime is 45399637. The reversal of 45399631 is 13699354.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13699354 = 2 ⋅6849677.

It is a cyclic number.

It is not a de Polignac number, because 45399631 - 2³ = 45399623 is a prime.

It is a super-2 number, since 2×45399631² = 4122252989872322, 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 (45399637) 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, 986926 + ... + 986971.

It is an arithmetic number, because the mean of its divisors is an integer number (11843388).

Almost surely, 2^45399631 is an apocalyptic number.

45399631 is a deficient number, since it is larger than the sum of its proper divisors (1973921).

45399631 is a wasteful number, since it uses less digits than its factorization.

45399631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973920.

The product of its digits is 87480, while the sum is 40.

The square root of 45399631 is about 6737.9248289069. The cubic root of 45399631 is about 356.7391509402.

The spelling of 45399631 in words is "forty-five million, three hundred ninety-nine thousand, six hundred thirty-one".