1291565248 has 14 divisors (see below), whose sum is σ = 2562949916. Its totient is φ = 645782592.

The previous prime is 1291565237. The next prime is 1291565251. The reversal of 1291565248 is 8425651921.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10090290 + ... + 10090417.

Almost surely, 2^1291565248 is an apocalyptic number.

It is an amenable number.

1291565248 is a deficient number, since it is larger than the sum of its proper divisors (1271384668).

1291565248 is an equidigital number, since it uses as much as digits as its factorization.

1291565248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20180719 (or 20180709 counting only the distinct ones).

The product of its digits is 172800, while the sum is 43.

The square root of 1291565248 is about 35938.3534403011. The cubic root of 1291565248 is about 1089.0273420567.

The spelling of 1291565248 in words is "one billion, two hundred ninety-one million, five hundred sixty-five thousand, two hundred forty-eight".