720919651 has 2 divisors, whose sum is σ = 720919652. Its totient is φ = 720919650.

The previous prime is 720919631. The next prime is 720919673. The reversal of 720919651 is 156919027.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 720919651 - 2⁹ = 720919139 is a prime.

It is not a weakly prime, because it can be changed into another prime (720919631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360459825 + 360459826.

It is an arithmetic number, because the mean of its divisors is an integer number (360459826).

Almost surely, 2^720919651 is an apocalyptic number.

720919651 is a deficient number, since it is larger than the sum of its proper divisors (1).

720919651 is an equidigital number, since it uses as much as digits as its factorization.

720919651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 40.

The square root of 720919651 is about 26849.9469459439. The cubic root of 720919651 is about 896.6623914305.

The spelling of 720919651 in words is "seven hundred twenty million, nine hundred nineteen thousand, six hundred fifty-one".