331078721 has 8 divisors (see below), whose sum is σ = 347998464. Its totient is φ = 314369440.

The previous prime is 331078711. The next prime is 331078739. The reversal of 331078721 is 127870133.

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 331078721 - 2¹⁴ = 331062337 is a prime.

It is a super-2 number, since 2×331078721² = 219226238997991682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (331078711) 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, 49385 + ... + 55686.

It is an arithmetic number, because the mean of its divisors is an integer number (43499808).

Almost surely, 2^331078721 is an apocalyptic number.

It is an amenable number.

331078721 is a deficient number, since it is larger than the sum of its proper divisors (16919743).

331078721 is a wasteful number, since it uses less digits than its factorization.

331078721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105231.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 331078721 is about 18195.5687187843. The cubic root of 331078721 is about 691.7944756186.

The spelling of 331078721 in words is "three hundred thirty-one million, seventy-eight thousand, seven hundred twenty-one".