212139649 has 8 divisors (see below), whose sum is σ = 221538240. Its totient is φ = 202755696.

The previous prime is 212139637. The next prime is 212139661. The reversal of 212139649 is 946931212.

212139649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (212139637) and next prime (212139661).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212139649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212134649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34587 + ... + 40255.

It is an arithmetic number, because the mean of its divisors is an integer number (27692280).

Almost surely, 2^212139649 is an apocalyptic number.

It is an amenable number.

212139649 is a deficient number, since it is larger than the sum of its proper divisors (9398591).

212139649 is a wasteful number, since it uses less digits than its factorization.

212139649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7319.

The product of its digits is 23328, while the sum is 37.

The square root of 212139649 is about 14565.0145554339. The cubic root of 212139649 is about 596.4040930676.

The spelling of 212139649 in words is "two hundred twelve million, one hundred thirty-nine thousand, six hundred forty-nine".