316729921 has 8 divisors (see below), whose sum is σ = 318795680. Its totient is φ = 314671392.

The previous prime is 316729913. The next prime is 316729937. The reversal of 316729921 is 129927613.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 316729921 - 2³ = 316729913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (316729901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105781 + ... + 108733.

It is an arithmetic number, because the mean of its divisors is an integer number (39849460).

Almost surely, 2^316729921 is an apocalyptic number.

It is an amenable number.

316729921 is a deficient number, since it is larger than the sum of its proper divisors (2065759).

316729921 is a wasteful number, since it uses less digits than its factorization.

316729921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3615.

The product of its digits is 40824, while the sum is 40.

The square root of 316729921 is about 17796.9076246409. The cubic root of 316729921 is about 681.6524983821.

The spelling of 316729921 in words is "three hundred sixteen million, seven hundred twenty-nine thousand, nine hundred twenty-one".