189955697 has 2 divisors, whose sum is σ = 189955698. Its totient is φ = 189955696.

The previous prime is 189955691. The next prime is 189955721. The reversal of 189955697 is 796559981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177395761 + 12559936 = 13319^2 + 3544^2 .

It is a cyclic number.

It is not a de Polignac number, because 189955697 - 2⁴ = 189955681 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189955691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94977848 + 94977849.

It is an arithmetic number, because the mean of its divisors is an integer number (94977849).

Almost surely, 2^189955697 is an apocalyptic number.

It is an amenable number.

189955697 is a deficient number, since it is larger than the sum of its proper divisors (1).

189955697 is an equidigital number, since it uses as much as digits as its factorization.

189955697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6123600, while the sum is 59.

The square root of 189955697 is about 13782.4416196841. The cubic root of 189955697 is about 574.8450213707.

The spelling of 189955697 in words is "one hundred eighty-nine million, nine hundred fifty-five thousand, six hundred ninety-seven".