381401931 has 4 divisors (see below), whose sum is σ = 508535912. Its totient is φ = 254267952.

The previous prime is 381401903. The next prime is 381401941. The reversal of 381401931 is 139104183.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 381401931 - 2¹¹ = 381399883 is a prime.

It is a super-2 number, since 2×381401931² = 290934865941057522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381401941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63566986 + ... + 63566991.

It is an arithmetic number, because the mean of its divisors is an integer number (127133978).

Almost surely, 2^381401931 is an apocalyptic number.

381401931 is a deficient number, since it is larger than the sum of its proper divisors (127133981).

381401931 is a wasteful number, since it uses less digits than its factorization.

381401931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127133980.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 381401931 is about 19529.5143564811. The cubic root of 381401931 is about 725.2052885165.

The spelling of 381401931 in words is "three hundred eighty-one million, four hundred one thousand, nine hundred thirty-one".