212394997 has 2 divisors, whose sum is σ = 212394998. Its totient is φ = 212394996.

The previous prime is 212394989. The next prime is 212395003. The reversal of 212394997 is 799493212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211818916 + 576081 = 14554^2 + 759^2 .

It is a cyclic number.

It is not a de Polignac number, because 212394997 - 2³ = 212394989 is a prime.

It is a super-2 number, since 2×212394997² = 90223269501260018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212394907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106197498 + 106197499.

It is an arithmetic number, because the mean of its divisors is an integer number (106197499).

Almost surely, 2^212394997 is an apocalyptic number.

It is an amenable number.

212394997 is a deficient number, since it is larger than the sum of its proper divisors (1).

212394997 is an equidigital number, since it uses as much as digits as its factorization.

212394997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 212394997 is about 14573.7777189032. Note that the first 4 decimals coincide. The cubic root of 212394997 is about 596.6432901106.

The spelling of 212394997 in words is "two hundred twelve million, three hundred ninety-four thousand, nine hundred ninety-seven".