311017121 has 2 divisors, whose sum is σ = 311017122. Its totient is φ = 311017120.

The previous prime is 311017093. The next prime is 311017127. The reversal of 311017121 is 121710113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 309232225 + 1784896 = 17585^2 + 1336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311017121 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311017121.

It is not a weakly prime, because it can be changed into another prime (311017127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155508560 + 155508561.

It is an arithmetic number, because the mean of its divisors is an integer number (155508561).

Almost surely, 2^311017121 is an apocalyptic number.

It is an amenable number.

311017121 is a deficient number, since it is larger than the sum of its proper divisors (1).

311017121 is an equidigital number, since it uses as much as digits as its factorization.

311017121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42, while the sum is 17.

The square root of 311017121 is about 17635.6775032886. The cubic root of 311017121 is about 677.5293277610.

Adding to 311017121 its reverse (121710113), we get a palindrome (432727234).

The spelling of 311017121 in words is "three hundred eleven million, seventeen thousand, one hundred twenty-one".