45540981 has 8 divisors (see below), whose sum is σ = 67468160. Its totient is φ = 30360636.

The previous prime is 45540973. The next prime is 45540983. The reversal of 45540981 is 18904554.

It is not a de Polignac number, because 45540981 - 2³ = 45540973 is a prime.

It is a super-2 number, since 2×45540981² = 4147961900884722, 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 (45540983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 843325 + ... + 843378.

It is an arithmetic number, because the mean of its divisors is an integer number (8433520).

Almost surely, 2^45540981 is an apocalyptic number.

It is an amenable number.

45540981 is a deficient number, since it is larger than the sum of its proper divisors (21927179).

45540981 is a wasteful number, since it uses less digits than its factorization.

45540981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686712 (or 1686706 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 45540981 is about 6748.4058117455. The cubic root of 45540981 is about 357.1089985654.

The spelling of 45540981 in words is "forty-five million, five hundred forty thousand, nine hundred eighty-one".