233455561 has 4 divisors (see below), whose sum is σ = 233486800. Its totient is φ = 233424324.

The previous prime is 233455549. The next prime is 233455567. The reversal of 233455561 is 165554332.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 233455561 - 2⁵ = 233455529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (233455567) 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, 2950 + ... + 21808.

It is an arithmetic number, because the mean of its divisors is an integer number (58371700).

Almost surely, 2^233455561 is an apocalyptic number.

It is an amenable number.

233455561 is a deficient number, since it is larger than the sum of its proper divisors (31239).

233455561 is a wasteful number, since it uses less digits than its factorization.

233455561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31238.

The product of its digits is 54000, while the sum is 34.

The square root of 233455561 is about 15279.2526322461. The cubic root of 233455561 is about 615.7457285657.

The spelling of 233455561 in words is "two hundred thirty-three million, four hundred fifty-five thousand, five hundred sixty-one".