213546457 has 4 divisors (see below), whose sum is σ = 214340580. Its totient is φ = 212752336.

The previous prime is 213546451. The next prime is 213546461. The reversal of 213546457 is 754645312.

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 34762816 + 178783641 = 5896^2 + 13371^2 .

It is a cyclic number.

It is not a de Polignac number, because 213546457 - 2³ = 213546449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213546451) 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 3 ways as a sum of consecutive naturals, for example, 396658 + ... + 397195.

It is an arithmetic number, because the mean of its divisors is an integer number (53585145).

Almost surely, 2^213546457 is an apocalyptic number.

It is an amenable number.

213546457 is a deficient number, since it is larger than the sum of its proper divisors (794123).

213546457 is an equidigital number, since it uses as much as digits as its factorization.

213546457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794122.

The product of its digits is 100800, while the sum is 37.

The square root of 213546457 is about 14613.2288355449. The cubic root of 213546457 is about 597.7195444443.

The spelling of 213546457 in words is "two hundred thirteen million, five hundred forty-six thousand, four hundred fifty-seven".