45139781 has 2 divisors, whose sum is σ = 45139782. Its totient is φ = 45139780.

The previous prime is 45139739. The next prime is 45139819. The reversal of 45139781 is 18793154.

It is an a-pointer prime, because the next prime (45139819) can be obtained adding 45139781 to its sum of digits (38).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41809156 + 3330625 = 6466^2 + 1825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45139781 is a prime.

It is a super-2 number, since 2×45139781² = 4075199657455922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45139711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22569890 + 22569891.

It is an arithmetic number, because the mean of its divisors is an integer number (22569891).

Almost surely, 2^45139781 is an apocalyptic number.

It is an amenable number.

45139781 is a deficient number, since it is larger than the sum of its proper divisors (1).

45139781 is an equidigital number, since it uses as much as digits as its factorization.

45139781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 45139781 is about 6718.6145149130. The cubic root of 45139781 is about 356.0572357791.

The spelling of 45139781 in words is "forty-five million, one hundred thirty-nine thousand, seven hundred eighty-one".