255145691 has 2 divisors, whose sum is σ = 255145692. Its totient is φ = 255145690.

The previous prime is 255145643. The next prime is 255145711. The reversal of 255145691 is 196541552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 255145691 - 2¹⁰ = 255144667 is a prime.

It is not a weakly prime, because it can be changed into another prime (255145591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127572845 + 127572846.

It is an arithmetic number, because the mean of its divisors is an integer number (127572846).

Almost surely, 2^255145691 is an apocalyptic number.

255145691 is a deficient number, since it is larger than the sum of its proper divisors (1).

255145691 is an equidigital number, since it uses as much as digits as its factorization.

255145691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54000, while the sum is 38.

The square root of 255145691 is about 15973.2805334408. The cubic root of 255145691 is about 634.2533154001.

The spelling of 255145691 in words is "two hundred fifty-five million, one hundred forty-five thousand, six hundred ninety-one".