212061655 has 16 divisors (see below), whose sum is σ = 290170944. Its totient is φ = 147386880.

The previous prime is 212061649. The next prime is 212061673. The reversal of 212061655 is 556160212.

It is not a de Polignac number, because 212061655 - 2⁵ = 212061623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94851 + ... + 97060.

It is an arithmetic number, because the mean of its divisors is an integer number (18135684).

Almost surely, 2^212061655 is an apocalyptic number.

212061655 is a deficient number, since it is larger than the sum of its proper divisors (78109289).

212061655 is a wasteful number, since it uses less digits than its factorization.

212061655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191946.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 212061655 is about 14562.3368660390. The cubic root of 212061655 is about 596.3309939828.

The spelling of 212061655 in words is "two hundred twelve million, sixty-one thousand, six hundred fifty-five".