190081897 has 2 divisors, whose sum is σ = 190081898. Its totient is φ = 190081896.

The previous prime is 190081889. The next prime is 190081937. The reversal of 190081897 is 798180091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129413376 + 60668521 = 11376^2 + 7789^2 .

It is an emirp because it is prime and its reverse (798180091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 190081897 - 2³ = 190081889 is a prime.

It is a super-2 number, since 2×190081897² = 72262255134237218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (190081597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95040948 + 95040949.

It is an arithmetic number, because the mean of its divisors is an integer number (95040949).

Almost surely, 2^190081897 is an apocalyptic number.

It is an amenable number.

190081897 is a deficient number, since it is larger than the sum of its proper divisors (1).

190081897 is an equidigital number, since it uses as much as digits as its factorization.

190081897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 190081897 is about 13787.0191484599. The cubic root of 190081897 is about 574.9722955776.

The spelling of 190081897 in words is "one hundred ninety million, eighty-one thousand, eight hundred ninety-seven".