211581285389 has 2 divisors, whose sum is σ = 211581285390. Its totient is φ = 211581285388.

The previous prime is 211581285373. The next prime is 211581285407. The reversal of 211581285389 is 983582185112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188464515625 + 23116769764 = 434125^2 + 152042^2 .

It is a cyclic number.

It is not a de Polignac number, because 211581285389 - 2⁴ = 211581285373 is a prime.

It is a super-2 number, since 2×211581285389² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211581285389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211581285359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105790642694 + 105790642695.

It is an arithmetic number, because the mean of its divisors is an integer number (105790642695).

Almost surely, 2^211581285389 is an apocalyptic number.

It is an amenable number.

211581285389 is a deficient number, since it is larger than the sum of its proper divisors (1).

211581285389 is an equidigital number, since it uses as much as digits as its factorization.

211581285389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1382400, while the sum is 53.

The spelling of 211581285389 in words is "two hundred eleven billion, five hundred eighty-one million, two hundred eighty-five thousand, three hundred eighty-nine".