723566989 has 2 divisors, whose sum is σ = 723566990. Its totient is φ = 723566988.

The previous prime is 723566981. The next prime is 723567011. The reversal of 723566989 is 989665327.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 693426889 + 30140100 = 26333^2 + 5490^2 .

It is a cyclic number.

It is not a de Polignac number, because 723566989 - 2³ = 723566981 is a prime.

It is a super-2 number, since 2×723566989² = 1047098375141052242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (723566981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361783494 + 361783495.

It is an arithmetic number, because the mean of its divisors is an integer number (361783495).

Almost surely, 2^723566989 is an apocalyptic number.

It is an amenable number.

723566989 is a deficient number, since it is larger than the sum of its proper divisors (1).

723566989 is an equidigital number, since it uses as much as digits as its factorization.

723566989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 55.

The square root of 723566989 is about 26899.2005271532. The cubic root of 723566989 is about 897.7586156337.

The spelling of 723566989 in words is "seven hundred twenty-three million, five hundred sixty-six thousand, nine hundred eighty-nine".