212315569 has 2 divisors, whose sum is σ = 212315570. Its totient is φ = 212315568.

The previous prime is 212315539. The next prime is 212315573. The reversal of 212315569 is 965513212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179962225 + 32353344 = 13415^2 + 5688^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212315569 is a prime.

It is a super-2 number, since 2×212315569² = 90155801679587522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212315539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106157784 + 106157785.

It is an arithmetic number, because the mean of its divisors is an integer number (106157785).

Almost surely, 2^212315569 is an apocalyptic number.

It is an amenable number.

212315569 is a deficient number, since it is larger than the sum of its proper divisors (1).

212315569 is an equidigital number, since it uses as much as digits as its factorization.

212315569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 34.

The square root of 212315569 is about 14571.0524328204. The cubic root of 212315569 is about 596.5689065445.

The spelling of 212315569 in words is "two hundred twelve million, three hundred fifteen thousand, five hundred sixty-nine".