311345389 has 2 divisors, whose sum is σ = 311345390. Its totient is φ = 311345388.

The previous prime is 311345383. The next prime is 311345467. The reversal of 311345389 is 983543113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217061289 + 94284100 = 14733^2 + 9710^2 .

It is a cyclic number.

It is not a de Polignac number, because 311345389 - 2⁵ = 311345357 is a prime.

It is a super-2 number, since 2×311345389² = 193871902503122642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311345383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155672694 + 155672695.

It is an arithmetic number, because the mean of its divisors is an integer number (155672695).

Almost surely, 2^311345389 is an apocalyptic number.

It is an amenable number.

311345389 is a deficient number, since it is larger than the sum of its proper divisors (1).

311345389 is an equidigital number, since it uses as much as digits as its factorization.

311345389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 37.

The square root of 311345389 is about 17644.9819778882. The cubic root of 311345389 is about 677.7676136720.

The spelling of 311345389 in words is "three hundred eleven million, three hundred forty-five thousand, three hundred eighty-nine".