323121157 has 4 divisors (see below), whose sum is σ = 323162476. Its totient is φ = 323079840.

The previous prime is 323121143. The next prime is 323121167. The reversal of 323121157 is 751121323.

It is a happy number.

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: 751121323 = 1051 ⋅714673.

It can be written as a sum of positive squares in 2 ways, for example, as 252460321 + 70660836 = 15889^2 + 8406^2 .

It is a cyclic number.

It is not a de Polignac number, because 323121157 - 2¹¹ = 323119109 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 (323121167) 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, 4944 + ... + 25897.

It is an arithmetic number, because the mean of its divisors is an integer number (80790619).

Almost surely, 2^323121157 is an apocalyptic number.

It is an amenable number.

323121157 is a deficient number, since it is larger than the sum of its proper divisors (41319).

323121157 is a wasteful number, since it uses less digits than its factorization.

323121157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41318.

The product of its digits is 1260, while the sum is 25.

The square root of 323121157 is about 17975.5711174916. The cubic root of 323121157 is about 686.2069806687.

The spelling of 323121157 in words is "three hundred twenty-three million, one hundred twenty-one thousand, one hundred fifty-seven".