311097 has 4 divisors (see below), whose sum is σ = 414800. Its totient is φ = 207396.

The previous prime is 311041. The next prime is 311099. The reversal of 311097 is 790113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 311097 - 2⁶ = 311033 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311099) 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, 51847 + ... + 51852.

It is an arithmetic number, because the mean of its divisors is an integer number (103700).

2³¹¹⁰⁹⁷ is an apocalyptic number.

It is an amenable number.

311097 is a deficient number, since it is larger than the sum of its proper divisors (103703).

311097 is a wasteful number, since it uses less digits than its factorization.

311097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103702.

The product of its (nonzero) digits is 189, while the sum is 21.

The square root of 311097 is about 557.7607013765. The cubic root of 311097 is about 67.7587326425.

It can be divided in two parts, 31 and 1097, that added together give a triangular number (1128 = T₄₇).

The spelling of 311097 in words is "three hundred eleven thousand, ninety-seven".