213697789 has 2 divisors, whose sum is σ = 213697790. Its totient is φ = 213697788.

The previous prime is 213697777. The next prime is 213697873. The reversal of 213697789 is 987796312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115390564 + 98307225 = 10742^2 + 9915^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213697789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213697739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106848894 + 106848895.

It is an arithmetic number, because the mean of its divisors is an integer number (106848895).

Almost surely, 2^213697789 is an apocalyptic number.

It is an amenable number.

213697789 is a deficient number, since it is larger than the sum of its proper divisors (1).

213697789 is an equidigital number, since it uses as much as digits as its factorization.

213697789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 52.

The square root of 213697789 is about 14618.4058296382. The cubic root of 213697789 is about 597.8607045720.

The spelling of 213697789 in words is "two hundred thirteen million, six hundred ninety-seven thousand, seven hundred eighty-nine".