23455551 has 16 divisors (see below), whose sum is σ = 36175104. Its totient is φ = 13240704.

The previous prime is 23455543. The next prime is 23455559. The reversal of 23455551 is 15555432.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (23455543) and next prime (23455559).

It is not a de Polignac number, because 23455551 - 2³ = 23455543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23455559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4986 + ... + 8471.

It is an arithmetic number, because the mean of its divisors is an integer number (2260944).

Almost surely, 2^23455551 is an apocalyptic number.

23455551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

23455551 is a deficient number, since it is larger than the sum of its proper divisors (12719553).

23455551 is a wasteful number, since it uses less digits than its factorization.

23455551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13550.

The product of its digits is 15000, while the sum is 30.

The square root of 23455551 is about 4843.0931232013. The cubic root of 23455551 is about 286.2520110713.

The spelling of 23455551 in words is "twenty-three million, four hundred fifty-five thousand, five hundred fifty-one".