100431491 has 2 divisors, whose sum is σ = 100431492. Its totient is φ = 100431490.

The previous prime is 100431467. The next prime is 100431493. The reversal of 100431491 is 194134001.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100431491 is a prime.

Together with 100431493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (100431493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50215745 + 50215746.

It is an arithmetic number, because the mean of its divisors is an integer number (50215746).

Almost surely, 2^100431491 is an apocalyptic number.

100431491 is a deficient number, since it is larger than the sum of its proper divisors (1).

100431491 is an equidigital number, since it uses as much as digits as its factorization.

100431491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 100431491 is about 10021.5513270152. The cubic root of 100431491 is about 464.8255267125.

Adding to 100431491 its reverse (194134001), we get a palindrome (294565492).

The spelling of 100431491 in words is "one hundred million, four hundred thirty-one thousand, four hundred ninety-one".