213777531389 has 2 divisors, whose sum is σ = 213777531390. Its totient is φ = 213777531388.

The previous prime is 213777531337. The next prime is 213777531449. The reversal of 213777531389 is 983135777312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196529962489 + 17247568900 = 443317^2 + 131330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213777531389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213777534389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106888765694 + 106888765695.

It is an arithmetic number, because the mean of its divisors is an integer number (106888765695).

Almost surely, 2^213777531389 is an apocalyptic number.

It is an amenable number.

213777531389 is a deficient number, since it is larger than the sum of its proper divisors (1).

213777531389 is an equidigital number, since it uses as much as digits as its factorization.

213777531389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6667920, while the sum is 56.

The spelling of 213777531389 in words is "two hundred thirteen billion, seven hundred seventy-seven million, five hundred thirty-one thousand, three hundred eighty-nine".