311055431 has 4 divisors (see below), whose sum is σ = 311499864. Its totient is φ = 310611000.

The previous prime is 311055419. The next prime is 311055449. The reversal of 311055431 is 134550113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 311055431 - 2¹⁰ = 311054407 is a prime.

It is a super-2 number, since 2×311055431² = 193510962309191522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311055397 and 311055406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311055401) 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, 221165 + ... + 222566.

It is an arithmetic number, because the mean of its divisors is an integer number (77874966).

Almost surely, 2^311055431 is an apocalyptic number.

311055431 is a deficient number, since it is larger than the sum of its proper divisors (444433).

311055431 is an equidigital number, since it uses as much as digits as its factorization.

311055431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444432.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 311055431 is about 17636.7636203471. The cubic root of 311055431 is about 677.5571451823.

The spelling of 311055431 in words is "three hundred eleven million, fifty-five thousand, four hundred thirty-one".