45540681 has 4 divisors (see below), whose sum is σ = 60720912. Its totient is φ = 30360452.

The previous prime is 45540679. The next prime is 45540731. The reversal of 45540681 is 18604554.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 45540681 - 2¹ = 45540679 is a prime.

It is a super-2 number, since 2×45540681² = 4147907251887522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (45540601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7590111 + ... + 7590116.

It is an arithmetic number, because the mean of its divisors is an integer number (15180228).

Almost surely, 2^45540681 is an apocalyptic number.

It is an amenable number.

45540681 is a deficient number, since it is larger than the sum of its proper divisors (15180231).

45540681 is a wasteful number, since it uses less digits than its factorization.

45540681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15180230.

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 45540681 is about 6748.3835842370. The cubic root of 45540681 is about 357.1082144150.

The spelling of 45540681 in words is "forty-five million, five hundred forty thousand, six hundred eighty-one".