313121666 has 16 divisors (see below), whose sum is σ = 551795328. Its totient is φ = 131379600.

The previous prime is 313121647. The next prime is 313121687. The reversal of 313121666 is 666121313.

It is a happy number.

313121666 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 547130 + ... + 547701.

It is an arithmetic number, because the mean of its divisors is an integer number (34487208).

Almost surely, 2^313121666 is an apocalyptic number.

313121666 is a deficient number, since it is larger than the sum of its proper divisors (238673662).

313121666 is a wasteful number, since it uses less digits than its factorization.

313121666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094857.

The product of its digits is 3888, while the sum is 29.

The square root of 313121666 is about 17695.2441633338. The cubic root of 313121666 is about 679.0540957231.

Adding to 313121666 its reverse (666121313), we get a palindrome (979242979).

The spelling of 313121666 in words is "three hundred thirteen million, one hundred twenty-one thousand, six hundred sixty-six".