163887631 has 2 divisors, whose sum is σ = 163887632. Its totient is φ = 163887630.

The previous prime is 163887617. The next prime is 163887643. The reversal of 163887631 is 136788361.

163887631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 163887631 - 2²⁷ = 29669903 is a prime.

It is a super-2 number, since 2×163887631² = 53718311189584322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163888631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81943815 + 81943816.

It is an arithmetic number, because the mean of its divisors is an integer number (81943816).

Almost surely, 2^163887631 is an apocalyptic number.

163887631 is a deficient number, since it is larger than the sum of its proper divisors (1).

163887631 is an equidigital number, since it uses as much as digits as its factorization.

163887631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 163887631 is about 12801.8604507314. The cubic root of 163887631 is about 547.2453237522.

The spelling of 163887631 in words is "one hundred sixty-three million, eight hundred eighty-seven thousand, six hundred thirty-one".