45311981 has 16 divisors (see below), whose sum is σ = 54479040. Its totient is φ = 37134720.

The previous prime is 45311971. The next prime is 45311989. The reversal of 45311981 is 18911354.

It is a cyclic number.

It is not a de Polignac number, because 45311981 - 2¹⁰ = 45310957 is a prime.

It is a super-2 number, since 2×45311981² = 4106351244288722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45311989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2465 + ... + 9833.

It is an arithmetic number, because the mean of its divisors is an integer number (3404940).

Almost surely, 2^45311981 is an apocalyptic number.

It is an amenable number.

45311981 is a deficient number, since it is larger than the sum of its proper divisors (9167059).

45311981 is a wasteful number, since it uses less digits than its factorization.

45311981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7436.

The product of its digits is 4320, while the sum is 32.

The square root of 45311981 is about 6731.4174584555. The cubic root of 45311981 is about 356.5094256468.

The spelling of 45311981 in words is "forty-five million, three hundred eleven thousand, nine hundred eighty-one".