100642631 has 2 divisors, whose sum is σ = 100642632. Its totient is φ = 100642630.

The previous prime is 100642621. The next prime is 100642637. The reversal of 100642631 is 136246001.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100642631 is a prime.

It is a super-2 number, since 2×100642631² = 20257878349204322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 100642597 and 100642606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100642637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50321315 + 50321316.

It is an arithmetic number, because the mean of its divisors is an integer number (50321316).

Almost surely, 2^100642631 is an apocalyptic number.

100642631 is a deficient number, since it is larger than the sum of its proper divisors (1).

100642631 is an equidigital number, since it uses as much as digits as its factorization.

100642631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 100642631 is about 10032.0800933804. The cubic root of 100642631 is about 465.1510373814.

Adding to 100642631 its reverse (136246001), we get a palindrome (236888632).

The spelling of 100642631 in words is "one hundred million, six hundred forty-two thousand, six hundred thirty-one".