23051551 has 4 divisors (see below), whose sum is σ = 23395672. Its totient is φ = 22707432.

The previous prime is 23051527. The next prime is 23051603. The reversal of 23051551 is 15515032.

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 23051551 - 2⁵ = 23051519 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 (23051521) 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, 171960 + ... + 172093.

It is an arithmetic number, because the mean of its divisors is an integer number (5848918).

Almost surely, 2^23051551 is an apocalyptic number.

23051551 is a deficient number, since it is larger than the sum of its proper divisors (344121).

23051551 is an equidigital number, since it uses as much as digits as its factorization.

23051551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344120.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 23051551 is about 4801.2030783961. The cubic root of 23051551 is about 284.5990092787.

Adding to 23051551 its reverse (15515032), we get a palindrome (38566583).

The spelling of 23051551 in words is "twenty-three million, fifty-one thousand, five hundred fifty-one".