721343153 has 2 divisors, whose sum is σ = 721343154. Its totient is φ = 721343152.

The previous prime is 721343107. The next prime is 721343159. The reversal of 721343153 is 351343127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 713317264 + 8025889 = 26708^2 + 2833^2 .

It is a cyclic number.

It is not a de Polignac number, because 721343153 - 2¹⁰ = 721342129 is a prime.

It is not a weakly prime, because it can be changed into another prime (721343159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360671576 + 360671577.

It is an arithmetic number, because the mean of its divisors is an integer number (360671577).

Almost surely, 2^721343153 is an apocalyptic number.

It is an amenable number.

721343153 is a deficient number, since it is larger than the sum of its proper divisors (1).

721343153 is an equidigital number, since it uses as much as digits as its factorization.

721343153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 29.

The square root of 721343153 is about 26857.8322468512. The cubic root of 721343153 is about 896.8379375685.

The spelling of 721343153 in words is "seven hundred twenty-one million, three hundred forty-three thousand, one hundred fifty-three".