213777531449 has 2 divisors, whose sum is σ = 213777531450. Its totient is φ = 213777531448.

The previous prime is 213777531389. The next prime is 213777531491. The reversal of 213777531449 is 944135777312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168340345849 + 45437185600 = 410293^2 + 213160^2 .

It is a cyclic number.

It is not a de Polignac number, because 213777531449 - 2²⁰ = 213776482873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213777531449.

It is not a weakly prime, because it can be changed into another prime (213777534449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106888765724 + 106888765725.

It is an arithmetic number, because the mean of its divisors is an integer number (106888765725).

Almost surely, 2^213777531449 is an apocalyptic number.

It is an amenable number.

213777531449 is a deficient number, since it is larger than the sum of its proper divisors (1).

213777531449 is an equidigital number, since it uses as much as digits as its factorization.

213777531449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4445280, while the sum is 53.

The spelling of 213777531449 in words is "two hundred thirteen billion, seven hundred seventy-seven million, five hundred thirty-one thousand, four hundred forty-nine".