1157091239 has 4 divisors (see below), whose sum is σ = 1157230656. Its totient is φ = 1156951824.

The previous prime is 1157091227. The next prime is 1157091251. The reversal of 1157091239 is 9321907511.

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

It is an interprime number because it is at equal distance from previous prime (1157091227) and next prime (1157091251).

It is a cyclic number.

It is not a de Polignac number, because 1157091239 - 2⁴ = 1157091223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157093239) 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, 56414 + ... + 74139.

It is an arithmetic number, because the mean of its divisors is an integer number (289307664).

Almost surely, 2^1157091239 is an apocalyptic number.

1157091239 is a deficient number, since it is larger than the sum of its proper divisors (139417).

1157091239 is an equidigital number, since it uses as much as digits as its factorization.

1157091239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139416.

The product of its (nonzero) digits is 17010, while the sum is 38.

The square root of 1157091239 is about 34016.0438469849. The cubic root of 1157091239 is about 1049.8385962035.

The spelling of 1157091239 in words is "one billion, one hundred fifty-seven million, ninety-one thousand, two hundred thirty-nine".