1261596261 has 16 divisors (see below), whose sum is σ = 1698480000. Its totient is φ = 832922688.

The previous prime is 1261596247. The next prime is 1261596277. The reversal of 1261596261 is 1626951621.

It is not a de Polignac number, because 1261596261 - 2⁹ = 1261595749 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261596211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151960 + ... + 160046.

It is an arithmetic number, because the mean of its divisors is an integer number (106155000).

Almost surely, 2^1261596261 is an apocalyptic number.

It is an amenable number.

1261596261 is a deficient number, since it is larger than the sum of its proper divisors (436883739).

1261596261 is a wasteful number, since it uses less digits than its factorization.

1261596261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8588.

The product of its digits is 38880, while the sum is 39.

The square root of 1261596261 is about 35518.9563613572. The cubic root of 1261596261 is about 1080.5382151050.

The spelling of 1261596261 in words is "one billion, two hundred sixty-one million, five hundred ninety-six thousand, two hundred sixty-one".