211542973 has 2 divisors, whose sum is σ = 211542974. Its totient is φ = 211542972.

The previous prime is 211542967. The next prime is 211543001. The reversal of 211542973 is 379245112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131744484 + 79798489 = 11478^2 + 8933^2 .

It is a cyclic number.

It is not a de Polignac number, because 211542973 - 2²⁵ = 177988541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211542923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105771486 + 105771487.

It is an arithmetic number, because the mean of its divisors is an integer number (105771487).

Almost surely, 2^211542973 is an apocalyptic number.

It is an amenable number.

211542973 is a deficient number, since it is larger than the sum of its proper divisors (1).

211542973 is an equidigital number, since it uses as much as digits as its factorization.

211542973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 211542973 is about 14544.5169393830. The cubic root of 211542973 is about 595.8444080206.

The spelling of 211542973 in words is "two hundred eleven million, five hundred forty-two thousand, nine hundred seventy-three".