255009691 has 2 divisors, whose sum is σ = 255009692. Its totient is φ = 255009690.

The previous prime is 255009683. The next prime is 255009739. The reversal of 255009691 is 196900552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255009691 - 2³ = 255009683 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 255009691.

It is not a weakly prime, because it can be changed into another prime (255009611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127504845 + 127504846.

It is an arithmetic number, because the mean of its divisors is an integer number (127504846).

Almost surely, 2^255009691 is an apocalyptic number.

255009691 is a deficient number, since it is larger than the sum of its proper divisors (1).

255009691 is an equidigital number, since it uses as much as digits as its factorization.

255009691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 255009691 is about 15969.0228567687. The cubic root of 255009691 is about 634.1406036116.

The spelling of 255009691 in words is "two hundred fifty-five million, nine thousand, six hundred ninety-one".