313121730 has 16 divisors (see below), whose sum is σ = 751492224. Its totient is φ = 83499120.

The previous prime is 313121717. The next prime is 313121741. The reversal of 313121730 is 37121313.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 313121697 and 313121706.

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, 5218666 + ... + 5218725.

It is an arithmetic number, because the mean of its divisors is an integer number (46968264).

Almost surely, 2^313121730 is an apocalyptic number.

313121730 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

313121730 is an abundant number, since it is smaller than the sum of its proper divisors (438370494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

313121730 is a wasteful number, since it uses less digits than its factorization.

313121730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10437401.

The product of its (nonzero) digits is 378, while the sum is 21.

The square root of 313121730 is about 17695.2459717292. The cubic root of 313121730 is about 679.0541419879.

The spelling of 313121730 in words is "three hundred thirteen million, one hundred twenty-one thousand, seven hundred thirty".