721675193 has 2 divisors, whose sum is σ = 721675194. Its totient is φ = 721675192.

The previous prime is 721675147. The next prime is 721675231. The reversal of 721675193 is 391576127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 580231744 + 141443449 = 24088^2 + 11893^2 .

It is a cyclic number.

It is not a de Polignac number, because 721675193 - 2²² = 717480889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721675193.

It is not a weakly prime, because it can be changed into another prime (721675103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360837596 + 360837597.

It is an arithmetic number, because the mean of its divisors is an integer number (360837597).

Almost surely, 2^721675193 is an apocalyptic number.

It is an amenable number.

721675193 is a deficient number, since it is larger than the sum of its proper divisors (1).

721675193 is an equidigital number, since it uses as much as digits as its factorization.

721675193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 41.

The square root of 721675193 is about 26864.0129727485. The cubic root of 721675193 is about 896.9755236758.

The spelling of 721675193 in words is "seven hundred twenty-one million, six hundred seventy-five thousand, one hundred ninety-three".