101521631 has 2 divisors, whose sum is σ = 101521632. Its totient is φ = 101521630.

The previous prime is 101521627. The next prime is 101521643. The reversal of 101521631 is 136125101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101521631 - 2² = 101521627 is a prime.

It is a super-2 number, since 2×101521631² = 20613283121800322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101521601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50760815 + 50760816.

It is an arithmetic number, because the mean of its divisors is an integer number (50760816).

Almost surely, 2^101521631 is an apocalyptic number.

101521631 is a deficient number, since it is larger than the sum of its proper divisors (1).

101521631 is an equidigital number, since it uses as much as digits as its factorization.

101521631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 101521631 is about 10075.7943111201. The cubic root of 101521631 is about 466.5013040527.

Adding to 101521631 its reverse (136125101), we get a palindrome (237646732).

The spelling of 101521631 in words is "one hundred one million, five hundred twenty-one thousand, six hundred thirty-one".