188904913 has 2 divisors, whose sum is σ = 188904914. Its totient is φ = 188904912.

The previous prime is 188904899. The next prime is 188904931. The reversal of 188904913 is 319409881.

188904913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (188904931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97377424 + 91527489 = 9868^2 + 9567^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188904913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 188904913.

It is not a weakly prime, because it can be changed into another prime (188904953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94452456 + 94452457.

It is an arithmetic number, because the mean of its divisors is an integer number (94452457).

Almost surely, 2^188904913 is an apocalyptic number.

It is an amenable number.

188904913 is a deficient number, since it is larger than the sum of its proper divisors (1).

188904913 is an equidigital number, since it uses as much as digits as its factorization.

188904913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 188904913 is about 13744.2683690330. The cubic root of 188904913 is about 573.7830980063.

The spelling of 188904913 in words is "one hundred eighty-eight million, nine hundred four thousand, nine hundred thirteen".