291261463189 has 2 divisors, whose sum is σ = 291261463190. Its totient is φ = 291261463188.

The previous prime is 291261463187. The next prime is 291261463277. The reversal of 291261463189 is 981364162192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168277987089 + 122983476100 = 410217^2 + 350690^2 .

It is a cyclic number.

It is not a de Polignac number, because 291261463189 - 2¹ = 291261463187 is a prime.

Together with 291261463187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291261463187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145630731594 + 145630731595.

It is an arithmetic number, because the mean of its divisors is an integer number (145630731595).

Almost surely, 2^291261463189 is an apocalyptic number.

It is an amenable number.

291261463189 is a deficient number, since it is larger than the sum of its proper divisors (1).

291261463189 is an equidigital number, since it uses as much as digits as its factorization.

291261463189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 52.

The spelling of 291261463189 in words is "two hundred ninety-one billion, two hundred sixty-one million, four hundred sixty-three thousand, one hundred eighty-nine".