1261255507 has 2 divisors, whose sum is σ = 1261255508. Its totient is φ = 1261255506.

The previous prime is 1261255451. The next prime is 1261255561. The reversal of 1261255507 is 7055521621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261255507 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261252507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630627753 + 630627754.

It is an arithmetic number, because the mean of its divisors is an integer number (630627754).

Almost surely, 2^1261255507 is an apocalyptic number.

1261255507 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261255507 is an equidigital number, since it uses as much as digits as its factorization.

1261255507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 1261255507 is about 35514.1592467005. The cubic root of 1261255507 is about 1080.4409227871.

The spelling of 1261255507 in words is "one billion, two hundred sixty-one million, two hundred fifty-five thousand, five hundred seven".