1157445823 has 4 divisors (see below), whose sum is σ = 1157549680. Its totient is φ = 1157341968.

The previous prime is 1157445787. The next prime is 1157445841. The reversal of 1157445823 is 3285447511.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3285447511 = 409 ⋅8032879.

It is a cyclic number.

It is not a de Polignac number, because 1157445823 - 2¹⁷ = 1157314751 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 (1157443823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32883 + ... + 58276.

It is an arithmetic number, because the mean of its divisors is an integer number (289387420).

Almost surely, 2^1157445823 is an apocalyptic number.

1157445823 is a deficient number, since it is larger than the sum of its proper divisors (103857).

1157445823 is an equidigital number, since it uses as much as digits as its factorization.

1157445823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103856.

The product of its digits is 134400, while the sum is 40.

The square root of 1157445823 is about 34021.2554589039. The cubic root of 1157445823 is about 1049.9458242645.

The spelling of 1157445823 in words is "one billion, one hundred fifty-seven million, four hundred forty-five thousand, eight hundred twenty-three".