721349371 has 2 divisors, whose sum is σ = 721349372. Its totient is φ = 721349370.

The previous prime is 721349359. The next prime is 721349401. The reversal of 721349371 is 173943127.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721349371 - 2⁷ = 721349243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721349371.

It is not a weakly prime, because it can be changed into another prime (721349311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360674685 + 360674686.

It is an arithmetic number, because the mean of its divisors is an integer number (360674686).

Almost surely, 2^721349371 is an apocalyptic number.

721349371 is a deficient number, since it is larger than the sum of its proper divisors (1).

721349371 is an equidigital number, since it uses as much as digits as its factorization.

721349371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 37.

The square root of 721349371 is about 26857.9480042687. The cubic root of 721349371 is about 896.8405144846.

The spelling of 721349371 in words is "seven hundred twenty-one million, three hundred forty-nine thousand, three hundred seventy-one".