45055981 has 2 divisors, whose sum is σ = 45055982. Its totient is φ = 45055980.

The previous prime is 45055963. The next prime is 45055993. The reversal of 45055981 is 18955054.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37711881 + 7344100 = 6141^2 + 2710^2 .

It is a cyclic number.

It is not a de Polignac number, because 45055981 - 2⁵ = 45055949 is a prime.

It is a super-2 number, since 2×45055981² = 4060082847744722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 45055981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45055921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22527990 + 22527991.

It is an arithmetic number, because the mean of its divisors is an integer number (22527991).

Almost surely, 2^45055981 is an apocalyptic number.

It is an amenable number.

45055981 is a deficient number, since it is larger than the sum of its proper divisors (1).

45055981 is an equidigital number, since it uses as much as digits as its factorization.

45055981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 37.

The square root of 45055981 is about 6712.3752129928. The cubic root of 45055981 is about 355.8367644726.

The spelling of 45055981 in words is "forty-five million, fifty-five thousand, nine hundred eighty-one".