159771631 has 2 divisors, whose sum is σ = 159771632. Its totient is φ = 159771630.

The previous prime is 159771611. The next prime is 159771637. The reversal of 159771631 is 136177951.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 159771631 - 2⁹ = 159771119 is a prime.

It is a super-2 number, since 2×159771631² = 51053948144800322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (159771637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79885815 + 79885816.

It is an arithmetic number, because the mean of its divisors is an integer number (79885816).

Almost surely, 2^159771631 is an apocalyptic number.

159771631 is a deficient number, since it is larger than the sum of its proper divisors (1).

159771631 is an equidigital number, since it uses as much as digits as its factorization.

159771631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39690, while the sum is 40.

The square root of 159771631 is about 12640.0803399346. The cubic root of 159771631 is about 542.6251133213.

The spelling of 159771631 in words is "one hundred fifty-nine million, seven hundred seventy-one thousand, six hundred thirty-one".