723100561 has 2 divisors, whose sum is σ = 723100562. Its totient is φ = 723100560.

The previous prime is 723100549. The next prime is 723100577. The reversal of 723100561 is 165001327.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 721459600 + 1640961 = 26860^2 + 1281^2 .

It is a cyclic number.

It is not a de Polignac number, because 723100561 - 2¹⁹ = 722576273 is a prime.

It is not a weakly prime, because it can be changed into another prime (723100501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361550280 + 361550281.

It is an arithmetic number, because the mean of its divisors is an integer number (361550281).

Almost surely, 2^723100561 is an apocalyptic number.

It is an amenable number.

723100561 is a deficient number, since it is larger than the sum of its proper divisors (1).

723100561 is an equidigital number, since it uses as much as digits as its factorization.

723100561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 723100561 is about 26890.5292063953. The cubic root of 723100561 is about 897.5656688526.

Adding to 723100561 its reverse (165001327), we get a palindrome (888101888).

The spelling of 723100561 in words is "seven hundred twenty-three million, one hundred thousand, five hundred sixty-one".