255161381 has 4 divisors (see below), whose sum is σ = 270170892. Its totient is φ = 240151872.

The previous prime is 255161359. The next prime is 255161383. The reversal of 255161381 is 183161552.

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

It can be written as a sum of positive squares in 2 ways, for example, as 134908225 + 120253156 = 11615^2 + 10966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255161381 is a prime.

It is a super-2 number, since 2×255161381² = 130214660707654322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255161383) 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, 7504730 + ... + 7504763.

It is an arithmetic number, because the mean of its divisors is an integer number (67542723).

Almost surely, 2^255161381 is an apocalyptic number.

It is an amenable number.

255161381 is a deficient number, since it is larger than the sum of its proper divisors (15009511).

255161381 is a wasteful number, since it uses less digits than its factorization.

255161381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15009510.

The product of its digits is 7200, while the sum is 32.

The square root of 255161381 is about 15973.7716585658. The cubic root of 255161381 is about 634.2663161168.

The spelling of 255161381 in words is "two hundred fifty-five million, one hundred sixty-one thousand, three hundred eighty-one".