381530131 has 2 divisors, whose sum is σ = 381530132. Its totient is φ = 381530130.

The previous prime is 381530059. The next prime is 381530147. The reversal of 381530131 is 131035183.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381530131 is a prime.

It is a super-2 number, since 2×381530131² = 291130481721754322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 381530096 and 381530105.

It is not a weakly prime, because it can be changed into another prime (381530531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190765065 + 190765066.

It is an arithmetic number, because the mean of its divisors is an integer number (190765066).

Almost surely, 2^381530131 is an apocalyptic number.

381530131 is a deficient number, since it is larger than the sum of its proper divisors (1).

381530131 is an equidigital number, since it uses as much as digits as its factorization.

381530131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 381530131 is about 19532.7962923899. The cubic root of 381530131 is about 725.2865334322.

It can be divided in two parts, 38 and 1530131, that added together give a square (1530169 = 1237²).

The spelling of 381530131 in words is "three hundred eighty-one million, five hundred thirty thousand, one hundred thirty-one".