381305631 has 16 divisors (see below), whose sum is σ = 615216384. Its totient is φ = 205071744.

The previous prime is 381305629. The next prime is 381305633. The reversal of 381305631 is 136503183.

It is an interprime number because it is at equal distance from previous prime (381305629) and next prime (381305633).

It is not a de Polignac number, because 381305631 - 2¹ = 381305629 is a prime.

It is a super-2 number, since 2×381305631² = 290787968464616322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381305633) 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, 533685 + ... + 534398.

It is an arithmetic number, because the mean of its divisors is an integer number (38451024).

Almost surely, 2^381305631 is an apocalyptic number.

381305631 is a deficient number, since it is larger than the sum of its proper divisors (233910753).

381305631 is a wasteful number, since it uses less digits than its factorization.

381305631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068110.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 381305631 is about 19527.0487017368. The cubic root of 381305631 is about 725.1442477944.

The spelling of 381305631 in words is "three hundred eighty-one million, three hundred five thousand, six hundred thirty-one".