1173323157 has 4 divisors (see below), whose sum is σ = 1564430880. Its totient is φ = 782215436.

The previous prime is 1173323149. The next prime is 1173323167. The reversal of 1173323157 is 7513233711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1173323157 - 2³ = 1173323149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1173323167) 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, 195553857 + ... + 195553862.

It is an arithmetic number, because the mean of its divisors is an integer number (391107720).

Almost surely, 2^1173323157 is an apocalyptic number.

It is an amenable number.

1173323157 is a deficient number, since it is larger than the sum of its proper divisors (391107723).

1173323157 is an equidigital number, since it uses as much as digits as its factorization.

1173323157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391107722.

The product of its digits is 13230, while the sum is 33.

The square root of 1173323157 is about 34253.8050003208. The cubic root of 1173323157 is about 1054.7249365639.

Adding to 1173323157 its reverse (7513233711), we get a palindrome (8686556868).

The spelling of 1173323157 in words is "one billion, one hundred seventy-three million, three hundred twenty-three thousand, one hundred fifty-seven".