320991607 has 4 divisors (see below), whose sum is σ = 321049080. Its totient is φ = 320934136.

The previous prime is 320991589. The next prime is 320991631. The reversal of 320991607 is 706199023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 706199023 = 17 ⋅41541119.

It is a cyclic number.

It is not a de Polignac number, because 320991607 - 2¹⁵ = 320958839 is a prime.

It is a super-2 number, since 2×320991607² = 206071223528884898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320991667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19333 + ... + 31870.

It is an arithmetic number, because the mean of its divisors is an integer number (80262270).

Almost surely, 2^320991607 is an apocalyptic number.

320991607 is a deficient number, since it is larger than the sum of its proper divisors (57473).

320991607 is an equidigital number, since it uses as much as digits as its factorization.

320991607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57472.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 320991607 is about 17916.2386398485. The cubic root of 320991607 is about 684.6961602027.

The spelling of 320991607 in words is "three hundred twenty million, nine hundred ninety-one thousand, six hundred seven".