187890063631 has 2 divisors, whose sum is σ = 187890063632. Its totient is φ = 187890063630.

The previous prime is 187890063601. The next prime is 187890063667. The reversal of 187890063631 is 136360098781.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187890063631 is a prime.

It is a super-2 number, since 2×187890063631² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187890063601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93945031815 + 93945031816.

It is an arithmetic number, because the mean of its divisors is an integer number (93945031816).

Almost surely, 2^187890063631 is an apocalyptic number.

187890063631 is a deficient number, since it is larger than the sum of its proper divisors (1).

187890063631 is an equidigital number, since it uses as much as digits as its factorization.

187890063631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 187890063631 in words is "one hundred eighty-seven billion, eight hundred ninety million, sixty-three thousand, six hundred thirty-one".