720955997 has 2 divisors, whose sum is σ = 720955998. Its totient is φ = 720955996.

The previous prime is 720955951. The next prime is 720956003. The reversal of 720955997 is 799559027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 567344761 + 153611236 = 23819^2 + 12394^2 .

It is a cyclic number.

It is not a de Polignac number, because 720955997 - 2¹² = 720951901 is a prime.

It is a super-2 number, since 2×720955997² = 1039555099220528018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720955927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360477998 + 360477999.

It is an arithmetic number, because the mean of its divisors is an integer number (360477999).

Almost surely, 2^720955997 is an apocalyptic number.

It is an amenable number.

720955997 is a deficient number, since it is larger than the sum of its proper divisors (1).

720955997 is an equidigital number, since it uses as much as digits as its factorization.

720955997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1786050, while the sum is 53.

The square root of 720955997 is about 26850.6237730150. The cubic root of 720955997 is about 896.6774599353.

The spelling of 720955997 in words is "seven hundred twenty million, nine hundred fifty-five thousand, nine hundred ninety-seven".