1253791291 has 4 divisors (see below), whose sum is σ = 1282949272. Its totient is φ = 1224633312.

The previous prime is 1253791289. The next prime is 1253791339. The reversal of 1253791291 is 1921973521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1253791291 - 2¹ = 1253791289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1253791211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14578926 + ... + 14579011.

It is an arithmetic number, because the mean of its divisors is an integer number (320737318).

Almost surely, 2^1253791291 is an apocalyptic number.

1253791291 is a deficient number, since it is larger than the sum of its proper divisors (29157981).

1253791291 is an equidigital number, since it uses as much as digits as its factorization.

1253791291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29157980.

The product of its digits is 34020, while the sum is 40.

The square root of 1253791291 is about 35408.9154168834. The cubic root of 1253791291 is about 1078.3053243106.

The spelling of 1253791291 in words is "one billion, two hundred fifty-three million, seven hundred ninety-one thousand, two hundred ninety-one".