101520631 has 2 divisors, whose sum is σ = 101520632. Its totient is φ = 101520630.

The previous prime is 101520623. The next prime is 101520649. The reversal of 101520631 is 136025101.

It is a weak prime.

It is an emirp because it is prime and its reverse (136025101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101520631 - 2³ = 101520623 is a prime.

It is a super-2 number, since 2×101520631² = 20612877037276322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 101520599 and 101520608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101521631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50760315 + 50760316.

It is an arithmetic number, because the mean of its divisors is an integer number (50760316).

Almost surely, 2^101520631 is an apocalyptic number.

101520631 is a deficient number, since it is larger than the sum of its proper divisors (1).

101520631 is an equidigital number, since it uses as much as digits as its factorization.

101520631 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 19.

The square root of 101520631 is about 10075.7446871187. The cubic root of 101520631 is about 466.4997723501.

Adding to 101520631 its reverse (136025101), we get a palindrome (237545732).

The spelling of 101520631 in words is "one hundred one million, five hundred twenty thousand, six hundred thirty-one".