213878274469 has 2 divisors, whose sum is σ = 213878274470. Its totient is φ = 213878274468.

The previous prime is 213878274457. The next prime is 213878274479. The reversal of 213878274469 is 964472878312.

213878274469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119283890625 + 94594383844 = 345375^2 + 307562^2 .

It is a cyclic number.

It is not a de Polignac number, because 213878274469 - 2²³ = 213869885861 is a prime.

It is a super-2 number, since 2×213878274469² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213878274409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106939137234 + 106939137235.

It is an arithmetic number, because the mean of its divisors is an integer number (106939137235).

Almost surely, 2^213878274469 is an apocalyptic number.

It is an amenable number.

213878274469 is a deficient number, since it is larger than the sum of its proper divisors (1).

213878274469 is an equidigital number, since it uses as much as digits as its factorization.

213878274469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32514048, while the sum is 61.

The spelling of 213878274469 in words is "two hundred thirteen billion, eight hundred seventy-eight million, two hundred seventy-four thousand, four hundred sixty-nine".