100031231 has 4 divisors (see below), whose sum is σ = 101002512. Its totient is φ = 99059952.

The previous prime is 100031189. The next prime is 100031263. The reversal of 100031231 is 132130001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132130001 = 17 ⋅7772353.

It is a cyclic number.

It is not a de Polignac number, because 100031231 - 2¹⁴ = 100014847 is a prime.

It is a super-2 number, since 2×100031231² = 20012494350750722, 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 (100033231) 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, 485486 + ... + 485691.

It is an arithmetic number, because the mean of its divisors is an integer number (25250628).

Almost surely, 2^100031231 is an apocalyptic number.

100031231 is a deficient number, since it is larger than the sum of its proper divisors (971281).

100031231 is an equidigital number, since it uses as much as digits as its factorization.

100031231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971280.

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

The square root of 100031231 is about 10001.5614280971. The cubic root of 100031231 is about 464.2071988188.

Adding to 100031231 its reverse (132130001), we get a palindrome (232161232).

The spelling of 100031231 in words is "one hundred million, thirty-one thousand, two hundred thirty-one".