18880513 has 2 divisors, whose sum is σ = 18880514. Its totient is φ = 18880512.

The previous prime is 18880469. The next prime is 18880517. The reversal of 18880513 is 31508881.

18880513 = 3072² + 3073².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9443329 + 9437184 = 3073^2 + 3072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18880513 is a prime.

It is a super-2 number, since 2×18880513² = 712947542286338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18880517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9440256 + 9440257.

It is an arithmetic number, because the mean of its divisors is an integer number (9440257).

Almost surely, 2^18880513 is an apocalyptic number.

18880513 is the 3073-rd centered square number.

It is an amenable number.

18880513 is a deficient number, since it is larger than the sum of its proper divisors (1).

18880513 is an equidigital number, since it uses as much as digits as its factorization.

18880513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 18880513 is about 4345.1712279265. The cubic root of 18880513 is about 266.2796209707.

The spelling of 18880513 in words is "eighteen million, eight hundred eighty thousand, five hundred thirteen".