190643969 has 2 divisors, whose sum is σ = 190643970. Its totient is φ = 190643968.

The previous prime is 190643951. The next prime is 190644023. The reversal of 190643969 is 969346091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188650225 + 1993744 = 13735^2 + 1412^2 .

It is a cyclic number.

It is not a de Polignac number, because 190643969 - 2¹⁶ = 190578433 is a prime.

It is a super-2 number, since 2×190643969² = 72690245832145922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (190643909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95321984 + 95321985.

It is an arithmetic number, because the mean of its divisors is an integer number (95321985).

Almost surely, 2^190643969 is an apocalyptic number.

It is an amenable number.

190643969 is a deficient number, since it is larger than the sum of its proper divisors (1).

190643969 is an equidigital number, since it uses as much as digits as its factorization.

190643969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 190643969 is about 13807.3882034221. The cubic root of 190643969 is about 575.5384687411.

The spelling of 190643969 in words is "one hundred ninety million, six hundred forty-three thousand, nine hundred sixty-nine".