381396631 has 16 divisors (see below), whose sum is σ = 478015488. Its totient is φ = 295624800.

The previous prime is 381396619. The next prime is 381396643. The reversal of 381396631 is 136693183.

It is an interprime number because it is at equal distance from previous prime (381396619) and next prime (381396643).

It is a cyclic number.

It is not a de Polignac number, because 381396631 - 2¹¹ = 381394583 is a prime.

It is a super-2 number, since 2×381396631² = 290926780276300322, 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 (381396601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1741 + ... + 27673.

It is an arithmetic number, because the mean of its divisors is an integer number (29875968).

Almost surely, 2^381396631 is an apocalyptic number.

381396631 is a deficient number, since it is larger than the sum of its proper divisors (96618857).

381396631 is a wasteful number, since it uses less digits than its factorization.

381396631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26142.

The product of its digits is 69984, while the sum is 40.

The square root of 381396631 is about 19529.3786639514. The cubic root of 381396631 is about 725.2019293255.

The spelling of 381396631 in words is "three hundred eighty-one million, three hundred ninety-six thousand, six hundred thirty-one".