212639497 has 4 divisors (see below), whose sum is σ = 243016576. Its totient is φ = 182262420.

The previous prime is 212639461. The next prime is 212639501. The reversal of 212639497 is 794936212.

212639497 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212639497 - 2¹¹ = 212637449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212630497) 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, 15188529 + ... + 15188542.

It is an arithmetic number, because the mean of its divisors is an integer number (60754144).

Almost surely, 2^212639497 is an apocalyptic number.

It is an amenable number.

212639497 is a deficient number, since it is larger than the sum of its proper divisors (30377079).

212639497 is an equidigital number, since it uses as much as digits as its factorization.

212639497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30377078.

The product of its digits is 163296, while the sum is 43.

The square root of 212639497 is about 14582.1636597591. The cubic root of 212639497 is about 596.8721456951.

The spelling of 212639497 in words is "two hundred twelve million, six hundred thirty-nine thousand, four hundred ninety-seven".