213894757 has 2 divisors, whose sum is σ = 213894758. Its totient is φ = 213894756.

The previous prime is 213894719. The next prime is 213894781. The reversal of 213894757 is 757498312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107516161 + 106378596 = 10369^2 + 10314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213894757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213894787) 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, 106947378 + 106947379.

It is an arithmetic number, because the mean of its divisors is an integer number (106947379).

Almost surely, 2^213894757 is an apocalyptic number.

It is an amenable number.

213894757 is a deficient number, since it is larger than the sum of its proper divisors (1).

213894757 is an equidigital number, since it uses as much as digits as its factorization.

213894757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 46.

The square root of 213894757 is about 14625.1412642750. The cubic root of 213894757 is about 598.0443334656.

The spelling of 213894757 in words is "two hundred thirteen million, eight hundred ninety-four thousand, seven hundred fifty-seven".