45555981 has 4 divisors (see below), whose sum is σ = 60741312. Its totient is φ = 30370652.

The previous prime is 45555967. The next prime is 45556033. The reversal of 45555981 is 18955554.

It is a happy number.

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 45555981 - 2¹⁷ = 45424909 is a prime.

It is a super-2 number, since 2×45555981² = 4150694809744722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45555911) 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, 7592661 + ... + 7592666.

It is an arithmetic number, because the mean of its divisors is an integer number (15185328).

Almost surely, 2^45555981 is an apocalyptic number.

It is an amenable number.

45555981 is a deficient number, since it is larger than the sum of its proper divisors (15185331).

45555981 is a wasteful number, since it uses less digits than its factorization.

45555981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15185330.

The product of its digits is 180000, while the sum is 42.

The square root of 45555981 is about 6749.5170938372. The cubic root of 45555981 is about 357.1482016953.

The spelling of 45555981 in words is "forty-five million, five hundred fifty-five thousand, nine hundred eighty-one".