212207749 has 4 divisors (see below), whose sum is σ = 228531436. Its totient is φ = 195884064.

The previous prime is 212207731. The next prime is 212207777. The reversal of 212207749 is 947702212.

It is a happy number.

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 122810724 + 89397025 = 11082^2 + 9455^2 .

It is a cyclic number.

It is not a de Polignac number, because 212207749 - 2⁵ = 212207717 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 (212207249) 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, 8161824 + ... + 8161849.

It is an arithmetic number, because the mean of its divisors is an integer number (57132859).

Almost surely, 2^212207749 is an apocalyptic number.

It is an amenable number.

212207749 is a deficient number, since it is larger than the sum of its proper divisors (16323687).

212207749 is a wasteful number, since it uses less digits than its factorization.

212207749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16323686.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 212207749 is about 14567.3521615975. The cubic root of 212207749 is about 596.4679044511.

The spelling of 212207749 in words is "two hundred twelve million, two hundred seven thousand, seven hundred forty-nine".