719365981 has 2 divisors, whose sum is σ = 719365982. Its totient is φ = 719365980.

The previous prime is 719365949. The next prime is 719366051. The reversal of 719365981 is 189563917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 715081081 + 4284900 = 26741^2 + 2070^2 .

It is an emirp because it is prime and its reverse (189563917) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 719365981 - 2⁵ = 719365949 is a prime.

It is a super-2 number, since 2×719365981² = 1034974829240184722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (719345981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359682990 + 359682991.

It is an arithmetic number, because the mean of its divisors is an integer number (359682991).

Almost surely, 2^719365981 is an apocalyptic number.

It is an amenable number.

719365981 is a deficient number, since it is larger than the sum of its proper divisors (1).

719365981 is an equidigital number, since it uses as much as digits as its factorization.

719365981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 49.

The square root of 719365981 is about 26820.9988814734. The cubic root of 719365981 is about 896.0177891112.

The spelling of 719365981 in words is "seven hundred nineteen million, three hundred sixty-five thousand, nine hundred eighty-one".