190000861081 has 2 divisors, whose sum is σ = 190000861082. Its totient is φ = 190000861080.

The previous prime is 190000861073. The next prime is 190000861087. The reversal of 190000861081 is 180168000091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188022835456 + 1978025625 = 433616^2 + 44475^2 .

It is an emirp because it is prime and its reverse (180168000091) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 180198000061 and 160000891081.

It is a cyclic number.

It is not a de Polignac number, because 190000861081 - 2³ = 190000861073 is a prime.

It is a super-2 number, since 2×190000861081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (190000861087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95000430540 + 95000430541.

It is an arithmetic number, because the mean of its divisors is an integer number (95000430541).

Almost surely, 2^190000861081 is an apocalyptic number.

It is an amenable number.

190000861081 is a deficient number, since it is larger than the sum of its proper divisors (1).

190000861081 is an equidigital number, since it uses as much as digits as its factorization.

190000861081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 34.

The spelling of 190000861081 in words is "one hundred ninety billion, eight hundred sixty-one thousand, eighty-one".