311320155 has 16 divisors (see below), whose sum is σ = 498756384. Its totient is φ = 165822720.

The previous prime is 311320103. The next prime is 311320159. The reversal of 311320155 is 551023113.

It is not a de Polignac number, because 311320155 - 2⁹ = 311319643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (311320159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1066 + ... + 24975.

It is an arithmetic number, because the mean of its divisors is an integer number (31172274).

Almost surely, 2^311320155 is an apocalyptic number.

311320155 is a deficient number, since it is larger than the sum of its proper divisors (187436229).

311320155 is a wasteful number, since it uses less digits than its factorization.

311320155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26846.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 311320155 is about 17644.2669159135. The cubic root of 311320155 is about 677.7493025502.

Adding to 311320155 its reverse (551023113), we get a palindrome (862343268).

The spelling of 311320155 in words is "three hundred eleven million, three hundred twenty thousand, one hundred fifty-five".