100631 has 4 divisors (see below), whose sum is σ = 101712. Its totient is φ = 99552.

The previous prime is 100621. The next prime is 100649. The reversal of 100631 is 136001.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 136001 = 307 ⋅443.

It is a cyclic number.

It is not a de Polignac number, because 100631 - 2¹⁰ = 99607 is a prime.

It is a super-2 number, since 2×100631² = 20253196322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386 + ... + 591.

It is an arithmetic number, because the mean of its divisors is an integer number (25428).

2¹⁰⁰⁶³¹ is an apocalyptic number.

100631 is a deficient number, since it is larger than the sum of its proper divisors (1081).

100631 is an equidigital number, since it uses as much as digits as its factorization.

100631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 100631 is about 317.2238956951. The cubic root of 100631 is about 46.5133117937.

Adding to 100631 its reverse (136001), we get a palindrome (236632).

The spelling of 100631 in words is "one hundred thousand, six hundred thirty-one".