100256431 has 4 divisors (see below), whose sum is σ = 109370664. Its totient is φ = 91142200.

The previous prime is 100256417. The next prime is 100256501. The reversal of 100256431 is 134652001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134652001 = 11 ⋅12241091.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100256431 is a prime.

It is a super-2 number, since 2×100256431² = 20102703913715522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100256411) 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, 4557100 + ... + 4557121.

It is an arithmetic number, because the mean of its divisors is an integer number (27342666).

Almost surely, 2^100256431 is an apocalyptic number.

100256431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

100256431 is a deficient number, since it is larger than the sum of its proper divisors (9114233).

100256431 is an equidigital number, since it uses as much as digits as its factorization.

100256431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9114232.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 100256431 is about 10012.8133409147. The cubic root of 100256431 is about 464.5552938031. Note that the first 3 decimals are identical.

The spelling of 100256431 in words is "one hundred million, two hundred fifty-six thousand, four hundred thirty-one".