100031431 has 4 divisors (see below), whose sum is σ = 102471264. Its totient is φ = 97591600.

The previous prime is 100031419. The next prime is 100031443. The reversal of 100031431 is 134130001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134130001 = 9323 ⋅14387.

It is an interprime number because it is at equal distance from previous prime (100031419) and next prime (100031443).

It is a cyclic number.

It is not a de Polignac number, because 100031431 - 2⁷ = 100031303 is a prime.

It is a super-2 number, since 2×100031431² = 20012574375815522, 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 (100031471) 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, 1219855 + ... + 1219936.

It is an arithmetic number, because the mean of its divisors is an integer number (25617816).

Almost surely, 2^100031431 is an apocalyptic number.

100031431 is a deficient number, since it is larger than the sum of its proper divisors (2439833).

100031431 is an equidigital number, since it uses as much as digits as its factorization.

100031431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2439832.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 100031431 is about 10001.5714265309. The cubic root of 100031431 is about 464.2075081934.

Adding to 100031431 its reverse (134130001), we get a palindrome (234161432).

The spelling of 100031431 in words is "one hundred million, thirty-one thousand, four hundred thirty-one".