45087981 has 32 divisors (see below), whose sum is σ = 65691648. Its totient is φ = 27424320.

The previous prime is 45087979. The next prime is 45087983. The reversal of 45087981 is 18978054.

It is an interprime number because it is at equal distance from previous prime (45087979) and next prime (45087983).

It is not a de Polignac number, because 45087981 - 2¹ = 45087979 is a prime.

It is a super-2 number, since 2×45087981² = 4065852061312722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45087983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 228775 + ... + 228971.

It is an arithmetic number, because the mean of its divisors is an integer number (2052864).

Almost surely, 2^45087981 is an apocalyptic number.

It is an amenable number.

45087981 is a deficient number, since it is larger than the sum of its proper divisors (20603667).

45087981 is a wasteful number, since it uses less digits than its factorization.

45087981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 45087981 is about 6714.7584468840. The cubic root of 45087981 is about 355.9209862306.

The spelling of 45087981 in words is "forty-five million, eighty-seven thousand, nine hundred eighty-one".