23215501 has 2 divisors, whose sum is σ = 23215502. Its totient is φ = 23215500.

The previous prime is 23215481. The next prime is 23215513. The reversal of 23215501 is 10551232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15920100 + 7295401 = 3990^2 + 2701^2 .

It is a cyclic number.

It is not a de Polignac number, because 23215501 - 2¹³ = 23207309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23215201) 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, 11607750 + 11607751.

It is an arithmetic number, because the mean of its divisors is an integer number (11607751).

Almost surely, 2^23215501 is an apocalyptic number.

It is an amenable number.

23215501 is a deficient number, since it is larger than the sum of its proper divisors (1).

23215501 is an equidigital number, since it uses as much as digits as its factorization.

23215501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 23215501 is about 4818.2466728054. The cubic root of 23215501 is about 285.2721356742.

Adding to 23215501 its reverse (10551232), we get a palindrome (33766733).

It can be divided in two parts, 23215 and 501, that added together give a square (23716 = 154²).

The spelling of 23215501 in words is "twenty-three million, two hundred fifteen thousand, five hundred one".