507165381 has 10 divisors (see below), whose sum is σ = 757617542. Its totient is φ = 338110200.

The previous prime is 507165377. The next prime is 507165431. The reversal of 507165381 is 183561705.

507165381 is a `hidden beast` number, since 50 + 71 + 6 + 538 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 495774756 + 11390625 = 22266^2 + 3375^2 .

It is not a de Polignac number, because 507165381 - 2² = 507165377 is a prime.

It is a super-2 number, since 2×507165381² = 514433447369750322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (507165881) 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 9 ways as a sum of consecutive naturals, for example, 3130570 + ... + 3130731.

Almost surely, 2^507165381 is an apocalyptic number.

It is an amenable number.

507165381 is a deficient number, since it is larger than the sum of its proper divisors (250452161).

507165381 is an equidigital number, since it uses as much as digits as its factorization.

507165381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6261313 (or 6261304 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 507165381 is about 22520.3326129966. The cubic root of 507165381 is about 797.4740018320.

The spelling of 507165381 in words is "five hundred seven million, one hundred sixty-five thousand, three hundred eighty-one".