189508313 has 2 divisors, whose sum is σ = 189508314. Its totient is φ = 189508312.

The previous prime is 189508309. The next prime is 189508321. The reversal of 189508313 is 313805981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146119744 + 43388569 = 12088^2 + 6587^2 .

It is a cyclic number.

It is not a de Polignac number, because 189508313 - 2² = 189508309 is a prime.

It is a super-2 number, since 2×189508313² = 71826801392211938, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189508343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94754156 + 94754157.

It is an arithmetic number, because the mean of its divisors is an integer number (94754157).

Almost surely, 2^189508313 is an apocalyptic number.

It is an amenable number.

189508313 is a deficient number, since it is larger than the sum of its proper divisors (1).

189508313 is an equidigital number, since it uses as much as digits as its factorization.

189508313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 189508313 is about 13766.2018363817. The cubic root of 189508313 is about 574.3933746016.

The spelling of 189508313 in words is "one hundred eighty-nine million, five hundred eight thousand, three hundred thirteen".