721990289941 has 2 divisors, whose sum is σ = 721990289942. Its totient is φ = 721990289940.

The previous prime is 721990289927. The next prime is 721990290137. The reversal of 721990289941 is 149982099127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395125388100 + 326864901841 = 628590^2 + 571721^2 .

It is a cyclic number.

It is not a de Polignac number, because 721990289941 - 2⁹ = 721990289429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721990289941.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721990289641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360995144970 + 360995144971.

It is an arithmetic number, because the mean of its divisors is an integer number (360995144971).

Almost surely, 2^721990289941 is an apocalyptic number.

It is an amenable number.

721990289941 is a deficient number, since it is larger than the sum of its proper divisors (1).

721990289941 is an equidigital number, since it uses as much as digits as its factorization.

721990289941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5878656, while the sum is 61.

The spelling of 721990289941 in words is "seven hundred twenty-one billion, nine hundred ninety million, two hundred eighty-nine thousand, nine hundred forty-one".