189136160581 has 2 divisors, whose sum is σ = 189136160582. Its totient is φ = 189136160580.

The previous prime is 189136160579. The next prime is 189136160599. The reversal of 189136160581 is 185061631981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117008464225 + 72127696356 = 342065^2 + 268566^2 .

It is a cyclic number.

It is not a de Polignac number, because 189136160581 - 2¹ = 189136160579 is a prime.

It is a super-2 number, since 2×189136160581² (a number of 23 digits) contains 22 as substring.

Together with 189136160579, 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 (189136160531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94568080290 + 94568080291.

It is an arithmetic number, because the mean of its divisors is an integer number (94568080291).

Almost surely, 2^189136160581 is an apocalyptic number.

It is an amenable number.

189136160581 is a deficient number, since it is larger than the sum of its proper divisors (1).

189136160581 is an equidigital number, since it uses as much as digits as its factorization.

189136160581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 49.

The spelling of 189136160581 in words is "one hundred eighty-nine billion, one hundred thirty-six million, one hundred sixty thousand, five hundred eighty-one".