1261361757 has 16 divisors (see below), whose sum is σ = 1740723840. Its totient is φ = 811484352.

The previous prime is 1261361747. The next prime is 1261361807. The reversal of 1261361757 is 7571631621.

It is not a de Polignac number, because 1261361757 - 2⁶ = 1261361693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261361737) 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, 317928 + ... + 321870.

It is an arithmetic number, because the mean of its divisors is an integer number (108795240).

Almost surely, 2^1261361757 is an apocalyptic number.

It is an amenable number.

1261361757 is a deficient number, since it is larger than the sum of its proper divisors (479362083).

1261361757 is a wasteful number, since it uses less digits than its factorization.

1261361757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7652.

The product of its digits is 52920, while the sum is 39.

The square root of 1261361757 is about 35515.6550974356. The cubic root of 1261361757 is about 1080.4712612406.

The spelling of 1261361757 in words is "one billion, two hundred sixty-one million, three hundred sixty-one thousand, seven hundred fifty-seven".