45315981 has 6 divisors (see below), whose sum is σ = 65456430. Its totient is φ = 30210648.

The previous prime is 45315971. The next prime is 45315989. The reversal of 45315981 is 18951354.

It can be written as a sum of positive squares in only one way, i.e., 38378025 + 6937956 = 6195^2 + 2634^2 .

It is not a de Polignac number, because 45315981 - 2⁶ = 45315917 is a prime.

It is a super-2 number, since 2×45315981² = 4107076267984722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45315989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2517546 + ... + 2517563.

It is an arithmetic number, because the mean of its divisors is an integer number (10909405).

Almost surely, 2^45315981 is an apocalyptic number.

It is an amenable number.

45315981 is a deficient number, since it is larger than the sum of its proper divisors (20140449).

45315981 is a wasteful number, since it uses less digits than its factorization.

45315981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5035115 (or 5035112 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 45315981 is about 6731.7145661414. The cubic root of 45315981 is about 356.5199158506.

The spelling of 45315981 in words is "forty-five million, three hundred fifteen thousand, nine hundred eighty-one".