7720331 has 2 divisors, whose sum is σ = 7720332. Its totient is φ = 7720330.

The previous prime is 7720319. The next prime is 7720337. The reversal of 7720331 is 1330277.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7720331 - 2²² = 3526027 is a prime.

It is a super-2 number, since 2×7720331² = 119207021499122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7720297 and 7720306.

It is not a weakly prime, because it can be changed into another prime (7720337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3860165 + 3860166.

It is an arithmetic number, because the mean of its divisors is an integer number (3860166).

Almost surely, 2^7720331 is an apocalyptic number.

7720331 is a deficient number, since it is larger than the sum of its proper divisors (1).

7720331 is an equidigital number, since it uses as much as digits as its factorization.

7720331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 882, while the sum is 23.

The square root of 7720331 is about 2778.5483620049. The cubic root of 7720331 is about 197.6417270384.

The spelling of 7720331 in words is "seven million, seven hundred twenty thousand, three hundred thirty-one".