255144991 has 4 divisors (see below), whose sum is σ = 255557800. Its totient is φ = 254732184.

The previous prime is 255144943. The next prime is 255145039. The reversal of 255144991 is 199441552.

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

It is an interprime number because it is at equal distance from previous prime (255144943) and next prime (255145039).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255144991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255144931) 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, 205476 + ... + 206713.

It is an arithmetic number, because the mean of its divisors is an integer number (63889450).

Almost surely, 2^255144991 is an apocalyptic number.

255144991 is a deficient number, since it is larger than the sum of its proper divisors (412809).

255144991 is an equidigital number, since it uses as much as digits as its factorization.

255144991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412808.

The product of its digits is 64800, while the sum is 40.

The square root of 255144991 is about 15973.2586218342. The cubic root of 255144991 is about 634.2527353685.

The spelling of 255144991 in words is "two hundred fifty-five million, one hundred forty-four thousand, nine hundred ninety-one".