311023121 has 4 divisors (see below), whose sum is σ = 313775652. Its totient is φ = 308270592.

The previous prime is 311023099. The next prime is 311023151. The reversal of 311023121 is 121320113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121320113 = 47 ⋅2581279.

It can be written as a sum of positive squares in 2 ways, for example, as 130416400 + 180606721 = 11420^2 + 13439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311023121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311023096 and 311023105.

It is not an unprimeable number, because it can be changed into a prime (311023151) 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, 1376096 + ... + 1376321.

It is an arithmetic number, because the mean of its divisors is an integer number (78443913).

Almost surely, 2^311023121 is an apocalyptic number.

It is an amenable number.

311023121 is a deficient number, since it is larger than the sum of its proper divisors (2752531).

311023121 is a wasteful number, since it uses less digits than its factorization.

311023121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2752530.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 311023121 is about 17635.8476121790. The cubic root of 311023121 is about 677.5336845949.

Adding to 311023121 its reverse (121320113), we get a palindrome (432343234).

The spelling of 311023121 in words is "three hundred eleven million, twenty-three thousand, one hundred twenty-one".