381290831 has 4 divisors (see below), whose sum is σ = 381752712. Its totient is φ = 380828952.

The previous prime is 381290821. The next prime is 381290843. The reversal of 381290831 is 138092183.

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

It is a cyclic number.

It is not a de Polignac number, because 381290831 - 2¹⁰ = 381289807 is a prime.

It is a super-2 number, since 2×381290831² = 290765395609341122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 381290791 and 381290800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381290821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229700 + ... + 231353.

It is an arithmetic number, because the mean of its divisors is an integer number (95438178).

Almost surely, 2^381290831 is an apocalyptic number.

381290831 is a deficient number, since it is larger than the sum of its proper divisors (461881).

381290831 is an equidigital number, since it uses as much as digits as its factorization.

381290831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461880.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 381290831 is about 19526.6697365424. The cubic root of 381290831 is about 725.1348657547.

The spelling of 381290831 in words is "three hundred eighty-one million, two hundred ninety thousand, eight hundred thirty-one".