1261492567 has 2 divisors, whose sum is σ = 1261492568. Its totient is φ = 1261492566.

The previous prime is 1261492513. The next prime is 1261492637. The reversal of 1261492567 is 7652941621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1261492567 - 2¹¹ = 1261490519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261492867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630746283 + 630746284.

It is an arithmetic number, because the mean of its divisors is an integer number (630746284).

Almost surely, 2^1261492567 is an apocalyptic number.

1261492567 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261492567 is an equidigital number, since it uses as much as digits as its factorization.

1261492567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The square root of 1261492567 is about 35517.4966319418. The cubic root of 1261492567 is about 1080.5086101770.

The spelling of 1261492567 in words is "one billion, two hundred sixty-one million, four hundred ninety-two thousand, five hundred sixty-seven".