45139621 has 2 divisors, whose sum is σ = 45139622. Its totient is φ = 45139620.

The previous prime is 45139613. The next prime is 45139663. The reversal of 45139621 is 12693154.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44742721 + 396900 = 6689^2 + 630^2 .

It is a cyclic number.

It is not a de Polignac number, because 45139621 - 2³ = 45139613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45139681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22569810 + 22569811.

It is an arithmetic number, because the mean of its divisors is an integer number (22569811).

Almost surely, 2^45139621 is an apocalyptic number.

It is an amenable number.

45139621 is a deficient number, since it is larger than the sum of its proper divisors (1).

45139621 is an equidigital number, since it uses as much as digits as its factorization.

45139621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 31.

The square root of 45139621 is about 6718.6026076856. The cubic root of 45139621 is about 356.0568150916.

The spelling of 45139621 in words is "forty-five million, one hundred thirty-nine thousand, six hundred twenty-one".