1255456691 has 2 divisors, whose sum is σ = 1255456692. Its totient is φ = 1255456690.

The previous prime is 1255456687. The next prime is 1255456717. The reversal of 1255456691 is 1966545521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1255456691 - 2² = 1255456687 is a prime.

It is not a weakly prime, because it can be changed into another prime (1255456291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627728345 + 627728346.

It is an arithmetic number, because the mean of its divisors is an integer number (627728346).

Almost surely, 2^1255456691 is an apocalyptic number.

1255456691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255456691 is an equidigital number, since it uses as much as digits as its factorization.

1255456691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324000, while the sum is 44.

The square root of 1255456691 is about 35432.4242890604. The cubic root of 1255456691 is about 1078.7825475845.

The spelling of 1255456691 in words is "one billion, two hundred fifty-five million, four hundred fifty-six thousand, six hundred ninety-one".