190531681 has 2 divisors, whose sum is σ = 190531682. Its totient is φ = 190531680.

The previous prime is 190531669. The next prime is 190531721. The reversal of 190531681 is 186135091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187142400 + 3389281 = 13680^2 + 1841^2 .

It is a cyclic number.

It is not a de Polignac number, because 190531681 - 2²¹ = 188434529 is a prime.

It is a super-2 number, since 2×190531681² = 72604642929371522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (190531651) 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, 95265840 + 95265841.

It is an arithmetic number, because the mean of its divisors is an integer number (95265841).

Almost surely, 2^190531681 is an apocalyptic number.

It is an amenable number.

190531681 is a deficient number, since it is larger than the sum of its proper divisors (1).

190531681 is an equidigital number, since it uses as much as digits as its factorization.

190531681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 190531681 is about 13803.3213756690. The cubic root of 190531681 is about 575.4254504691.

The spelling of 190531681 in words is "one hundred ninety million, five hundred thirty-one thousand, six hundred eighty-one".