212897281 has 3 divisors (see below), whose sum is σ = 212911873. Its totient is φ = 212882690.

The previous prime is 212897219. The next prime is 212897303. The reversal of 212897281 is 182798212.

The square root of 212897281 is 14591.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 212897281 - 2⁹ = 212896769 is a prime.

It is a super-2 number, since 2×212897281² = 90650504514385922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212897981) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7296 + ... + 21886.

Almost surely, 2^212897281 is an apocalyptic number.

212897281 is the 14591-st square number.

212897281 is the 7296-th centered octagonal number.

It is an amenable number.

212897281 is a deficient number, since it is larger than the sum of its proper divisors (14592).

212897281 is an frugal number, since it uses more digits than its factorization.

212897281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29182 (or 14591 counting only the distinct ones).

The product of its digits is 32256, while the sum is 40.

The cubic root of 212897281 is about 597.1132453911.

The spelling of 212897281 in words is "two hundred twelve million, eight hundred ninety-seven thousand, two hundred eighty-one".