212161651 has 8 divisors (see below), whose sum is σ = 236360880. Its totient is φ = 189088032.

The previous prime is 212161627. The next prime is 212161669. The reversal of 212161651 is 156161212.

It is a happy number.

212161651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212161651 - 2¹¹ = 212159603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212161051) 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, 281005 + ... + 281758.

It is an arithmetic number, because the mean of its divisors is an integer number (29545110).

Almost surely, 2^212161651 is an apocalyptic number.

212161651 is a deficient number, since it is larger than the sum of its proper divisors (24199229).

212161651 is a wasteful number, since it uses less digits than its factorization.

212161651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562805.

The product of its digits is 720, while the sum is 25.

The square root of 212161651 is about 14565.7698389066. The cubic root of 212161651 is about 596.4247109787.

The spelling of 212161651 in words is "two hundred twelve million, one hundred sixty-one thousand, six hundred fifty-one".