313123821 has 4 divisors (see below), whose sum is σ = 417498432. Its totient is φ = 208749212.

The previous prime is 313123813. The next prime is 313123843. The reversal of 313123821 is 128321313.

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 a cyclic number.

It is not a de Polignac number, because 313123821 - 2³ = 313123813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 313123791 and 313123800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313123861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52187301 + ... + 52187306.

It is an arithmetic number, because the mean of its divisors is an integer number (104374608).

Almost surely, 2^313123821 is an apocalyptic number.

It is an amenable number.

313123821 is a deficient number, since it is larger than the sum of its proper divisors (104374611).

313123821 is a wasteful number, since it uses less digits than its factorization.

313123821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104374610.

The product of its digits is 864, while the sum is 24.

The square root of 313123821 is about 17695.3050552964. The cubic root of 313123821 is about 679.0556535396.

The spelling of 313123821 in words is "three hundred thirteen million, one hundred twenty-three thousand, eight hundred twenty-one".