23407561 has 2 divisors, whose sum is σ = 23407562. Its totient is φ = 23407560.

The previous prime is 23407541. The next prime is 23407603. The reversal of 23407561 is 16570432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21678336 + 1729225 = 4656^2 + 1315^2 .

It is a cyclic number.

It is not a de Polignac number, because 23407561 - 2⁵ = 23407529 is a prime.

It is not a weakly prime, because it can be changed into another prime (23407541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11703780 + 11703781.

It is an arithmetic number, because the mean of its divisors is an integer number (11703781).

Almost surely, 2^23407561 is an apocalyptic number.

It is an amenable number.

23407561 is a deficient number, since it is larger than the sum of its proper divisors (1).

23407561 is an equidigital number, since it uses as much as digits as its factorization.

23407561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 23407561 is about 4838.1361080482. The cubic root of 23407561 is about 286.0566541392.

Adding to 23407561 its reverse (16570432), we get a palindrome (39977993).

The spelling of 23407561 in words is "twenty-three million, four hundred seven thousand, five hundred sixty-one".