189345517 has 2 divisors, whose sum is σ = 189345518. Its totient is φ = 189345516.

The previous prime is 189345479. The next prime is 189345547. The reversal of 189345517 is 715543981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160250281 + 29095236 = 12659^2 + 5394^2 .

It is an emirp because it is prime and its reverse (715543981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189345517 - 2¹⁵ = 189312749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189345547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94672758 + 94672759.

It is an arithmetic number, because the mean of its divisors is an integer number (94672759).

Almost surely, 2^189345517 is an apocalyptic number.

It is an amenable number.

189345517 is a deficient number, since it is larger than the sum of its proper divisors (1).

189345517 is an equidigital number, since it uses as much as digits as its factorization.

189345517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 43.

The square root of 189345517 is about 13760.2876786788. The cubic root of 189345517 is about 574.2288510666.

The spelling of 189345517 in words is "one hundred eighty-nine million, three hundred forty-five thousand, five hundred seventeen".