23261551 has 4 divisors (see below), whose sum is σ = 23289552. Its totient is φ = 23233552.

The previous prime is 23261549. The next prime is 23261573. The reversal of 23261551 is 15516232.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23261551 - 2¹ = 23261549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23261521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12715 + ... + 14428.

It is an arithmetic number, because the mean of its divisors is an integer number (5822388).

Almost surely, 2^23261551 is an apocalyptic number.

23261551 is a deficient number, since it is larger than the sum of its proper divisors (28001).

23261551 is an equidigital number, since it uses as much as digits as its factorization.

23261551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28000.

The product of its digits is 1800, while the sum is 25.

The square root of 23261551 is about 4823.0230146662. The cubic root of 23261551 is about 285.4606319353.

Adding to 23261551 its reverse (15516232), we get a palindrome (38777783).

The spelling of 23261551 in words is "twenty-three million, two hundred sixty-one thousand, five hundred fifty-one".