381509131 has 4 divisors (see below), whose sum is σ = 384885432. Its totient is φ = 378132832.

The previous prime is 381509129. The next prime is 381509153. The reversal of 381509131 is 131905183.

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 381509131 - 2¹ = 381509129 is a prime.

It is a super-2 number, since 2×381509131² = 291098434072750322, 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 = 381509093 and 381509102.

It is not an unprimeable number, because it can be changed into a prime (381509101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1687981 + ... + 1688206.

It is an arithmetic number, because the mean of its divisors is an integer number (96221358).

Almost surely, 2^381509131 is an apocalyptic number.

381509131 is a deficient number, since it is larger than the sum of its proper divisors (3376301).

381509131 is a wasteful number, since it uses less digits than its factorization.

381509131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3376300.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 381509131 is about 19532.2587275512. The cubic root of 381509131 is about 725.2732262293.

The spelling of 381509131 in words is "three hundred eighty-one million, five hundred nine thousand, one hundred thirty-one".