311402161 has 16 divisors (see below), whose sum is σ = 368124928. Its totient is φ = 257774400.

The previous prime is 311402137. The next prime is 311402167. The reversal of 311402161 is 161204113.

It is a cyclic number.

It is not a de Polignac number, because 311402161 - 2¹⁷ = 311271089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311402167) 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, 131851 + ... + 134191.

It is an arithmetic number, because the mean of its divisors is an integer number (23007808).

Almost surely, 2^311402161 is an apocalyptic number.

311402161 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

311402161 is a deficient number, since it is larger than the sum of its proper divisors (56722767).

311402161 is a wasteful number, since it uses less digits than its factorization.

311402161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2992.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 311402161 is about 17646.5906338873. The cubic root of 311402161 is about 677.8088068140.

Adding to 311402161 its reverse (161204113), we get a palindrome (472606274).

The spelling of 311402161 in words is "three hundred eleven million, four hundred two thousand, one hundred sixty-one".