381091731 has 4 divisors (see below), whose sum is σ = 508122312. Its totient is φ = 254061152.

The previous prime is 381091727. The next prime is 381091741. The reversal of 381091731 is 137190183.

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 381091731 - 2² = 381091727 is a prime.

It is a super-2 number, since 2×381091731² = 290461814873152722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 381091692 and 381091701.

It is not an unprimeable number, because it can be changed into a prime (381091741) 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, 63515286 + ... + 63515291.

It is an arithmetic number, because the mean of its divisors is an integer number (127030578).

Almost surely, 2^381091731 is an apocalyptic number.

381091731 is a deficient number, since it is larger than the sum of its proper divisors (127030581).

381091731 is a wasteful number, since it uses less digits than its factorization.

381091731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127030580.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 381091731 is about 19521.5709152722. The cubic root of 381091731 is about 725.0086283555.

The spelling of 381091731 in words is "three hundred eighty-one million, ninety-one thousand, seven hundred thirty-one".