311145321 has 32 divisors (see below), whose sum is σ = 444216960. Its totient is φ = 193342464.

The previous prime is 311145299. The next prime is 311145343. The reversal of 311145321 is 123541113.

It is an interprime number because it is at equal distance from previous prime (311145299) and next prime (311145343).

It is not a de Polignac number, because 311145321 - 2⁹ = 311144809 is a prime.

It is a super-2 number, since 2×311145321² = 193622821560386082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (311145361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 524401 + ... + 524993.

It is an arithmetic number, because the mean of its divisors is an integer number (13881780).

Almost surely, 2^311145321 is an apocalyptic number.

It is an amenable number.

311145321 is a deficient number, since it is larger than the sum of its proper divisors (133071639).

311145321 is a wasteful number, since it uses less digits than its factorization.

311145321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825.

The product of its digits is 360, while the sum is 21.

The square root of 311145321 is about 17639.3118063036. The cubic root of 311145321 is about 677.6224065899.

Adding to 311145321 its reverse (123541113), we get a palindrome (434686434).

The spelling of 311145321 in words is "three hundred eleven million, one hundred forty-five thousand, three hundred twenty-one".