720812401 has 2 divisors, whose sum is σ = 720812402. Its totient is φ = 720812400.

The previous prime is 720812369. The next prime is 720812413. The reversal of 720812401 is 104218027.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 518746176 + 202066225 = 22776^2 + 14215^2 .

It is an emirp because it is prime and its reverse (104218027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 720812401 - 2⁵ = 720812369 is a prime.

It is not a weakly prime, because it can be changed into another prime (720812441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360406200 + 360406201.

It is an arithmetic number, because the mean of its divisors is an integer number (360406201).

Almost surely, 2^720812401 is an apocalyptic number.

It is an amenable number.

720812401 is a deficient number, since it is larger than the sum of its proper divisors (1).

720812401 is an equidigital number, since it uses as much as digits as its factorization.

720812401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 720812401 is about 26847.9496610076. The cubic root of 720812401 is about 896.6179242417.

The spelling of 720812401 in words is "seven hundred twenty million, eight hundred twelve thousand, four hundred one".