211479997 has 2 divisors, whose sum is σ = 211479998. Its totient is φ = 211479996.

The previous prime is 211479971. The next prime is 211480007. The reversal of 211479997 is 799974112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141824281 + 69655716 = 11909^2 + 8346^2 .

It is a cyclic number.

It is not a de Polignac number, because 211479997 - 2⁷ = 211479869 is a prime.

It is a super-2 number, since 2×211479997² = 89447578262240018, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211479997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211479907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105739998 + 105739999.

It is an arithmetic number, because the mean of its divisors is an integer number (105739999).

Almost surely, 2^211479997 is an apocalyptic number.

It is an amenable number.

211479997 is a deficient number, since it is larger than the sum of its proper divisors (1).

211479997 is an equidigital number, since it uses as much as digits as its factorization.

211479997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 49.

The square root of 211479997 is about 14542.3518386814. The cubic root of 211479997 is about 595.7852748476.

The spelling of 211479997 in words is "two hundred eleven million, four hundred seventy-nine thousand, nine hundred ninety-seven".