255513431 has 2 divisors, whose sum is σ = 255513432. Its totient is φ = 255513430.

The previous prime is 255513407. The next prime is 255513443. The reversal of 255513431 is 134315552.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255513431 is a prime.

It is a super-2 number, since 2×255513431² = 130574226842783522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 255513394 and 255513403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255513491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127756715 + 127756716.

It is an arithmetic number, because the mean of its divisors is an integer number (127756716).

Almost surely, 2^255513431 is an apocalyptic number.

255513431 is a deficient number, since it is larger than the sum of its proper divisors (1).

255513431 is an equidigital number, since it uses as much as digits as its factorization.

255513431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 29.

The square root of 255513431 is about 15984.7874868576. The cubic root of 255513431 is about 634.5578843269.

Adding to 255513431 its reverse (134315552), we get a palindrome (389828983).

It can be divided in two parts, 25551 and 3431, that added together give a palindrome (28982).

The spelling of 255513431 in words is "two hundred fifty-five million, five hundred thirteen thousand, four hundred thirty-one".