45515981 has 16 divisors (see below), whose sum is σ = 53346816. Its totient is φ = 38030256.

The previous prime is 45515971. The next prime is 45516007. The reversal of 45515981 is 18951554.

45515981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 45515981 - 2⁶ = 45515917 is a prime.

It is a super-2 number, since 2×45515981² = 4143409052784722, 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 (45515971) 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 15 ways as a sum of consecutive naturals, for example, 49730 + ... + 50636.

It is an arithmetic number, because the mean of its divisors is an integer number (3334176).

Almost surely, 2^45515981 is an apocalyptic number.

It is an amenable number.

45515981 is a deficient number, since it is larger than the sum of its proper divisors (7830835).

45515981 is a wasteful number, since it uses less digits than its factorization.

45515981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088.

The product of its digits is 36000, while the sum is 38.

The square root of 45515981 is about 6746.5532681511. The cubic root of 45515981 is about 357.0436408816.

The spelling of 45515981 in words is "forty-five million, five hundred fifteen thousand, nine hundred eighty-one".