1261540568 has 32 divisors (see below), whose sum is σ = 2491921200. Its totient is φ = 597082752.

The previous prime is 1261540559. The next prime is 1261540589. The reversal of 1261540568 is 8650451621.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240146 + ... + 245342.

Almost surely, 2^1261540568 is an apocalyptic number.

It is an amenable number.

1261540568 is a deficient number, since it is larger than the sum of its proper divisors (1230380632).

1261540568 is a wasteful number, since it uses less digits than its factorization.

1261540568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6819 (or 6815 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 1261540568 is about 35518.1723628905. The cubic root of 1261540568 is about 1080.5223147989.

The spelling of 1261540568 in words is "one billion, two hundred sixty-one million, five hundred forty thousand, five hundred sixty-eight".