311031089 has 4 divisors (see below), whose sum is σ = 311325300. Its totient is φ = 310736880.

The previous prime is 311031053. The next prime is 311031103. The reversal of 311031089 is 980130113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 980130113 = 53 ⋅18493021.

It can be written as a sum of positive squares in 2 ways, for example, as 190909489 + 120121600 = 13817^2 + 10960^2 .

It is a cyclic number.

It is not a de Polignac number, because 311031089 - 2¹² = 311026993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (311030089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145514 + ... + 147635.

It is an arithmetic number, because the mean of its divisors is an integer number (77831325).

Almost surely, 2^311031089 is an apocalyptic number.

It is an amenable number.

311031089 is a deficient number, since it is larger than the sum of its proper divisors (294211).

311031089 is a wasteful number, since it uses less digits than its factorization.

311031089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294210.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 311031089 is about 17636.0735142491. The cubic root of 311031089 is about 677.5394703837.

The spelling of 311031089 in words is "three hundred eleven million, thirty-one thousand, eighty-nine".