189957517 has 2 divisors, whose sum is σ = 189957518. Its totient is φ = 189957516.

The previous prime is 189957499. The next prime is 189957527. The reversal of 189957517 is 715759981.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107765161 + 82192356 = 10381^2 + 9066^2 .

It is a cyclic number.

It is not a de Polignac number, because 189957517 - 2⁷ = 189957389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189957527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94978758 + 94978759.

It is an arithmetic number, because the mean of its divisors is an integer number (94978759).

Almost surely, 2^189957517 is an apocalyptic number.

It is an amenable number.

189957517 is a deficient number, since it is larger than the sum of its proper divisors (1).

189957517 is an equidigital number, since it uses as much as digits as its factorization.

189957517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 793800, while the sum is 52.

The square root of 189957517 is about 13782.5076455629. The cubic root of 189957517 is about 574.8468572629.

The spelling of 189957517 in words is "one hundred eighty-nine million, nine hundred fifty-seven thousand, five hundred seventeen".