45503981 has 2 divisors, whose sum is σ = 45503982. Its totient is φ = 45503980.

The previous prime is 45503977. The next prime is 45503999. The reversal of 45503981 is 18930554.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40513225 + 4990756 = 6365^2 + 2234^2 .

It is a cyclic number.

It is not a de Polignac number, because 45503981 - 2² = 45503977 is a prime.

It is a super-2 number, since 2×45503981² = 4141224573696722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45503911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22751990 + 22751991.

It is an arithmetic number, because the mean of its divisors is an integer number (22751991).

Almost surely, 2^45503981 is an apocalyptic number.

It is an amenable number.

45503981 is a deficient number, since it is larger than the sum of its proper divisors (1).

45503981 is an equidigital number, since it uses as much as digits as its factorization.

45503981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 45503981 is about 6745.6638665145. The cubic root of 45503981 is about 357.0122606925.

The spelling of 45503981 in words is "forty-five million, five hundred three thousand, nine hundred eighty-one".