212654561 has 6 divisors (see below), whose sum is σ = 247373730. Its totient is φ = 182275296.

The previous prime is 212654537. The next prime is 212654567. The reversal of 212654561 is 165456212.

It can be written as a sum of positive squares in only one way, i.e., 196000000 + 16654561 = 14000^2 + 4081^2 .

It is a de Polignac number, because none of the positive numbers 2^k-212654561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212654567) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2169896 + ... + 2169993.

It is an arithmetic number, because the mean of its divisors is an integer number (41228955).

Almost surely, 2^212654561 is an apocalyptic number.

It is an amenable number.

212654561 is a deficient number, since it is larger than the sum of its proper divisors (34719169).

212654561 is an equidigital number, since it uses as much as digits as its factorization.

212654561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4339903 (or 4339896 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 212654561 is about 14582.6801720397. The cubic root of 212654561 is about 596.8862400815.

The spelling of 212654561 in words is "two hundred twelve million, six hundred fifty-four thousand, five hundred sixty-one".