189308731 has 2 divisors, whose sum is σ = 189308732. Its totient is φ = 189308730.

The previous prime is 189308677. The next prime is 189308737. The reversal of 189308731 is 137803981.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189308731 is a prime.

It is a super-2 number, since 2×189308731² = 71675591265660722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (189308737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94654365 + 94654366.

It is an arithmetic number, because the mean of its divisors is an integer number (94654366).

Almost surely, 2^189308731 is an apocalyptic number.

189308731 is a deficient number, since it is larger than the sum of its proper divisors (1).

189308731 is an equidigital number, since it uses as much as digits as its factorization.

189308731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 189308731 is about 13758.9509411147. The cubic root of 189308731 is about 574.1916616452.

The spelling of 189308731 in words is "one hundred eighty-nine million, three hundred eight thousand, seven hundred thirty-one".