190551631 has 2 divisors, whose sum is σ = 190551632. Its totient is φ = 190551630.

The previous prime is 190551629. The next prime is 190551661. The reversal of 190551631 is 136155091.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 190551631 - 2¹ = 190551629 is a prime.

It is a super-2 number, since 2×190551631² = 72619848153520322, which contains 22 as substring.

Together with 190551629, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 190551593 and 190551602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190551611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95275815 + 95275816.

It is an arithmetic number, because the mean of its divisors is an integer number (95275816).

Almost surely, 2^190551631 is an apocalyptic number.

190551631 is a deficient number, since it is larger than the sum of its proper divisors (1).

190551631 is an equidigital number, since it uses as much as digits as its factorization.

190551631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 190551631 is about 13804.0440089128. The cubic root of 190551631 is about 575.4455334583.

The spelling of 190551631 in words is "one hundred ninety million, five hundred fifty-one thousand, six hundred thirty-one".