190390028261 has 2 divisors, whose sum is σ = 190390028262. Its totient is φ = 190390028260.

The previous prime is 190390028237. The next prime is 190390028303. The reversal of 190390028261 is 162820093091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181484520100 + 8905508161 = 426010^2 + 94369^2 .

It is a cyclic number.

It is not a de Polignac number, because 190390028261 - 2¹⁸ = 190389766117 is a prime.

It is a super-2 number, since 2×190390028261² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190390028201) 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, 95195014130 + 95195014131.

It is an arithmetic number, because the mean of its divisors is an integer number (95195014131).

Almost surely, 2^190390028261 is an apocalyptic number.

It is an amenable number.

190390028261 is a deficient number, since it is larger than the sum of its proper divisors (1).

190390028261 is an equidigital number, since it uses as much as digits as its factorization.

190390028261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 41.

The spelling of 190390028261 in words is "one hundred ninety billion, three hundred ninety million, twenty-eight thousand, two hundred sixty-one".