213438877 has 2 divisors, whose sum is σ = 213438878. Its totient is φ = 213438876.

The previous prime is 213438847. The next prime is 213438917. The reversal of 213438877 is 778834312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211382521 + 2056356 = 14539^2 + 1434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213438877 is a prime.

It is a super-2 number, since 2×213438877² = 91112308430042258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213438847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106719438 + 106719439.

It is an arithmetic number, because the mean of its divisors is an integer number (106719439).

Almost surely, 2^213438877 is an apocalyptic number.

It is an amenable number.

213438877 is a deficient number, since it is larger than the sum of its proper divisors (1).

213438877 is an equidigital number, since it uses as much as digits as its factorization.

213438877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 43.

The square root of 213438877 is about 14609.5474604794. The cubic root of 213438877 is about 597.6191549388.

The spelling of 213438877 in words is "two hundred thirteen million, four hundred thirty-eight thousand, eight hundred seventy-seven".