1261853167 has 2 divisors, whose sum is σ = 1261853168. Its totient is φ = 1261853166.

The previous prime is 1261853149. The next prime is 1261853221. The reversal of 1261853167 is 7613581621.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261853167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261853267) 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, 630926583 + 630926584.

It is an arithmetic number, because the mean of its divisors is an integer number (630926584).

Almost surely, 2^1261853167 is an apocalyptic number.

1261853167 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261853167 is an equidigital number, since it uses as much as digits as its factorization.

1261853167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 1261853167 is about 35522.5726405056. The cubic root of 1261853167 is about 1080.6115555015.

The spelling of 1261853167 in words is "one billion, two hundred sixty-one million, eight hundred fifty-three thousand, one hundred sixty-seven".