212909797 has 2 divisors, whose sum is σ = 212909798. Its totient is φ = 212909796.

The previous prime is 212909789. The next prime is 212909821. The reversal of 212909797 is 797909212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179801281 + 33108516 = 13409^2 + 5754^2 .

It is a cyclic number.

It is not a de Polignac number, because 212909797 - 2³ = 212909789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212909897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106454898 + 106454899.

It is an arithmetic number, because the mean of its divisors is an integer number (106454899).

Almost surely, 2^212909797 is an apocalyptic number.

It is an amenable number.

212909797 is a deficient number, since it is larger than the sum of its proper divisors (1).

212909797 is an equidigital number, since it uses as much as digits as its factorization.

212909797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884, while the sum is 46.

The square root of 212909797 is about 14591.4288882206. The cubic root of 212909797 is about 597.1249463750.

The spelling of 212909797 in words is "two hundred twelve million, nine hundred nine thousand, seven hundred ninety-seven".