255243139 has 2 divisors, whose sum is σ = 255243140. Its totient is φ = 255243138.

The previous prime is 255243101. The next prime is 255243143. The reversal of 255243139 is 931342552.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255243139 is a prime.

It is not a weakly prime, because it can be changed into another prime (255243199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127621569 + 127621570.

It is an arithmetic number, because the mean of its divisors is an integer number (127621570).

Almost surely, 2^255243139 is an apocalyptic number.

255243139 is a deficient number, since it is larger than the sum of its proper divisors (1).

255243139 is an equidigital number, since it uses as much as digits as its factorization.

255243139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 34.

The square root of 255243139 is about 15976.3305862141. The cubic root of 255243139 is about 634.3340520828.

The spelling of 255243139 in words is "two hundred fifty-five million, two hundred forty-three thousand, one hundred thirty-nine".