381497931 has 10 divisors (see below), whose sum is σ = 569892092. Its totient is φ = 254331900.

The previous prime is 381497899. The next prime is 381497947. The reversal of 381497931 is 139794183.

It is not a de Polignac number, because 381497931 - 2⁵ = 381497899 is a prime.

It is a super-2 number, since 2×381497931² = 291081342714561522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381497971) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2354845 + ... + 2355006.

Almost surely, 2^381497931 is an apocalyptic number.

381497931 is a deficient number, since it is larger than the sum of its proper divisors (188394161).

381497931 is an equidigital number, since it uses as much as digits as its factorization.

381497931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4709863 (or 4709854 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 381497931 is about 19531.9720202544. The cubic root of 381497931 is about 725.2661288547.

The spelling of 381497931 in words is "three hundred eighty-one million, four hundred ninety-seven thousand, nine hundred thirty-one".