213455345 has 4 divisors (see below), whose sum is σ = 256146420. Its totient is φ = 170764272.

The previous prime is 213455321. The next prime is 213455351. The reversal of 213455345 is 543554312.

It is a happy number.

213455345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 138321121 + 75134224 = 11761^2 + 8668^2 .

It is a cyclic number.

It is not a de Polignac number, because 213455345 - 2¹⁰ = 213454321 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21345530 + ... + 21345539.

It is an arithmetic number, because the mean of its divisors is an integer number (64036605).

Almost surely, 2^213455345 is an apocalyptic number.

It is an amenable number.

213455345 is a deficient number, since it is larger than the sum of its proper divisors (42691075).

213455345 is an equidigital number, since it uses as much as digits as its factorization.

213455345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42691074.

The product of its digits is 36000, while the sum is 32.

The square root of 213455345 is about 14610.1110536505. Note that the first 3 decimals coincide. The cubic root of 213455345 is about 597.6345244273.

The spelling of 213455345 in words is "two hundred thirteen million, four hundred fifty-five thousand, three hundred forty-five".