23361551 has 4 divisors (see below), whose sum is σ = 23384592. Its totient is φ = 23338512.

The previous prime is 23361539. The next prime is 23361589. The reversal of 23361551 is 15516332.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23361551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23361551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23361511) 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, 9926 + ... + 12051.

It is an arithmetic number, because the mean of its divisors is an integer number (5846148).

Almost surely, 2^23361551 is an apocalyptic number.

23361551 is a deficient number, since it is larger than the sum of its proper divisors (23041).

23361551 is a wasteful number, since it uses less digits than its factorization.

23361551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23040.

The product of its digits is 2700, while the sum is 26.

The square root of 23361551 is about 4833.3788388662. The cubic root of 23361551 is about 285.8691064846.

Adding to 23361551 its reverse (15516332), we get a palindrome (38877883).

The spelling of 23361551 in words is "twenty-three million, three hundred sixty-one thousand, five hundred fifty-one".