213254551 has 4 divisors (see below), whose sum is σ = 222526512. Its totient is φ = 203982592.

The previous prime is 213254539. The next prime is 213254567. The reversal of 213254551 is 155452312.

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 213254551 - 2⁹ = 213254039 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 (213254581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4635946 + ... + 4635991.

It is an arithmetic number, because the mean of its divisors is an integer number (55631628).

Almost surely, 2^213254551 is an apocalyptic number.

213254551 is a deficient number, since it is larger than the sum of its proper divisors (9271961).

213254551 is an equidigital number, since it uses as much as digits as its factorization.

213254551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9271960.

The product of its digits is 6000, while the sum is 28.

The square root of 213254551 is about 14603.2376889510. The cubic root of 213254551 is about 597.4470705844.

The spelling of 213254551 in words is "two hundred thirteen million, two hundred fifty-four thousand, five hundred fifty-one".