212061639 has 8 divisors (see below), whose sum is σ = 288083952. Its totient is φ = 138706880.

The previous prime is 212061623. The next prime is 212061643. The reversal of 212061639 is 936160212.

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

It is a cyclic number.

It is not a de Polignac number, because 212061639 - 2⁴ = 212061623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212061649) 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, 666702 + ... + 667019.

It is an arithmetic number, because the mean of its divisors is an integer number (36010494).

Almost surely, 2^212061639 is an apocalyptic number.

212061639 is a deficient number, since it is larger than the sum of its proper divisors (76022313).

212061639 is a wasteful number, since it uses less digits than its factorization.

212061639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333777.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 212061639 is about 14562.3363166767. The cubic root of 212061639 is about 596.3309789851.

The spelling of 212061639 in words is "two hundred twelve million, sixty-one thousand, six hundred thirty-nine".