213722797 has 2 divisors, whose sum is σ = 213722798. Its totient is φ = 213722796.

The previous prime is 213722783. The next prime is 213722819. The reversal of 213722797 is 797227312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169885156 + 43837641 = 13034^2 + 6621^2 .

It is a cyclic number.

It is not a de Polignac number, because 213722797 - 2¹⁹ = 213198509 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213722737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106861398 + 106861399.

It is an arithmetic number, because the mean of its divisors is an integer number (106861399).

Almost surely, 2^213722797 is an apocalyptic number.

It is an amenable number.

213722797 is a deficient number, since it is larger than the sum of its proper divisors (1).

213722797 is an equidigital number, since it uses as much as digits as its factorization.

213722797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74088, while the sum is 40.

The square root of 213722797 is about 14619.2611646417. The cubic root of 213722797 is about 597.8840252272.

The spelling of 213722797 in words is "two hundred thirteen million, seven hundred twenty-two thousand, seven hundred ninety-seven".