721714649 has 2 divisors, whose sum is σ = 721714650. Its totient is φ = 721714648.

The previous prime is 721714613. The next prime is 721714661. The reversal of 721714649 is 946417127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 673662025 + 48052624 = 25955^2 + 6932^2 .

It is a cyclic number.

It is not a de Polignac number, because 721714649 - 2⁸ = 721714393 is a prime.

It is not a weakly prime, because it can be changed into another prime (721714699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360857324 + 360857325.

It is an arithmetic number, because the mean of its divisors is an integer number (360857325).

Almost surely, 2^721714649 is an apocalyptic number.

It is an amenable number.

721714649 is a deficient number, since it is larger than the sum of its proper divisors (1).

721714649 is an equidigital number, since it uses as much as digits as its factorization.

721714649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 721714649 is about 26864.7473280506. The cubic root of 721714649 is about 896.9918700976.

The spelling of 721714649 in words is "seven hundred twenty-one million, seven hundred fourteen thousand, six hundred forty-nine".