720691429 has 2 divisors, whose sum is σ = 720691430. Its totient is φ = 720691428.

The previous prime is 720691427. The next prime is 720691457. The reversal of 720691429 is 924196027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 515199204 + 205492225 = 22698^2 + 14335^2 .

It is a cyclic number.

It is not a de Polignac number, because 720691429 - 2¹ = 720691427 is a prime.

It is a super-2 number, since 2×720691429² = 1038792271668124082, which contains 22 as substring.

Together with 720691427, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 720691391 and 720691400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720691427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360345714 + 360345715.

It is an arithmetic number, because the mean of its divisors is an integer number (360345715).

Almost surely, 2^720691429 is an apocalyptic number.

It is an amenable number.

720691429 is a deficient number, since it is larger than the sum of its proper divisors (1).

720691429 is an equidigital number, since it uses as much as digits as its factorization.

720691429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 720691429 is about 26845.6966570063. The cubic root of 720691429 is about 896.5677624466.

The spelling of 720691429 in words is "seven hundred twenty million, six hundred ninety-one thousand, four hundred twenty-nine".