45039881 has 2 divisors, whose sum is σ = 45039882. Its totient is φ = 45039880.

The previous prime is 45039857. The next prime is 45039887. The reversal of 45039881 is 18893054.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44769481 + 270400 = 6691^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 45039881 - 2¹⁰ = 45038857 is a prime.

It is a super-2 number, since 2×45039881² = 4057181760988322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (45039887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22519940 + 22519941.

It is an arithmetic number, because the mean of its divisors is an integer number (22519941).

Almost surely, 2^45039881 is an apocalyptic number.

It is an amenable number.

45039881 is a deficient number, since it is larger than the sum of its proper divisors (1).

45039881 is an equidigital number, since it uses as much as digits as its factorization.

45039881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 45039881 is about 6711.1758284223. The cubic root of 45039881 is about 355.7943753210.

The spelling of 45039881 in words is "forty-five million, thirty-nine thousand, eight hundred eighty-one".