1157227391 has 4 divisors (see below), whose sum is σ = 1157445672. Its totient is φ = 1157009112.

The previous prime is 1157227381. The next prime is 1157227399. The reversal of 1157227391 is 1937227511.

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 1157227391 - 2⁶ = 1157227327 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 (1157227399) 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, 100985 + ... + 111858.

It is an arithmetic number, because the mean of its divisors is an integer number (289361418).

Almost surely, 2^1157227391 is an apocalyptic number.

1157227391 is a deficient number, since it is larger than the sum of its proper divisors (218281).

1157227391 is an equidigital number, since it uses as much as digits as its factorization.

1157227391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218280.

The product of its digits is 26460, while the sum is 38.

The square root of 1157227391 is about 34018.0450790459. The cubic root of 1157227391 is about 1049.8797718727.

The spelling of 1157227391 in words is "one billion, one hundred fifty-seven million, two hundred twenty-seven thousand, three hundred ninety-one".