212696657 has 2 divisors, whose sum is σ = 212696658. Its totient is φ = 212696656.

The previous prime is 212696599. The next prime is 212696681. The reversal of 212696657 is 756696212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212255761 + 440896 = 14569^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 212696657 - 2²⁰ = 211648081 is a prime.

It is not a weakly prime, because it can be changed into another prime (212696557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106348328 + 106348329.

It is an arithmetic number, because the mean of its divisors is an integer number (106348329).

Almost surely, 2^212696657 is an apocalyptic number.

It is an amenable number.

212696657 is a deficient number, since it is larger than the sum of its proper divisors (1).

212696657 is an equidigital number, since it uses as much as digits as its factorization.

212696657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 44.

The square root of 212696657 is about 14584.1234566908. The cubic root of 212696657 is about 596.9256229900.

The spelling of 212696657 in words is "two hundred twelve million, six hundred ninety-six thousand, six hundred fifty-seven".