720660971 has 2 divisors, whose sum is σ = 720660972. Its totient is φ = 720660970.

The previous prime is 720660961. The next prime is 720660973. The reversal of 720660971 is 179066027.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 720660971 - 2⁶ = 720660907 is a prime.

It is a Sophie Germain prime.

Together with 720660973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (720660973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360330485 + 360330486.

It is an arithmetic number, because the mean of its divisors is an integer number (360330486).

Almost surely, 2^720660971 is an apocalyptic number.

720660971 is a deficient number, since it is larger than the sum of its proper divisors (1).

720660971 is an equidigital number, since it uses as much as digits as its factorization.

720660971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 720660971 is about 26845.1293720109. The cubic root of 720660971 is about 896.5551319621. Note that the first 3 decimals are identical.

The spelling of 720660971 in words is "seven hundred twenty million, six hundred sixty thousand, nine hundred seventy-one".