45831981 has 32 divisors (see below), whose sum is σ = 68640768. Its totient is φ = 27011520.

The previous prime is 45831941. The next prime is 45831997. The reversal of 45831981 is 18913854.

It is not a de Polignac number, because 45831981 - 2⁶ = 45831917 is a prime.

It is a super-2 number, since 2×45831981² = 4201140964768722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45831901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 201790 + ... + 202016.

It is an arithmetic number, because the mean of its divisors is an integer number (2145024).

Almost surely, 2^45831981 is an apocalyptic number.

It is an amenable number.

45831981 is a deficient number, since it is larger than the sum of its proper divisors (22808787).

45831981 is a wasteful number, since it uses less digits than its factorization.

45831981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441.

The product of its digits is 34560, while the sum is 39.

The square root of 45831981 is about 6769.9321266908. The cubic root of 45831981 is about 357.8680084145.

The spelling of 45831981 in words is "forty-five million, eight hundred thirty-one thousand, nine hundred eighty-one".