190198381 has 2 divisors, whose sum is σ = 190198382. Its totient is φ = 190198380.

The previous prime is 190198367. The next prime is 190198391. The reversal of 190198381 is 183891091.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99301225 + 90897156 = 9965^2 + 9534^2 .

It is a cyclic number.

It is not a de Polignac number, because 190198381 - 2¹⁷ = 190067309 is a prime.

It is a super-2 number, since 2×190198381² = 72350848270042322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190198391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95099190 + 95099191.

It is an arithmetic number, because the mean of its divisors is an integer number (95099191).

Almost surely, 2^190198381 is an apocalyptic number.

It is an amenable number.

190198381 is a deficient number, since it is larger than the sum of its proper divisors (1).

190198381 is an equidigital number, since it uses as much as digits as its factorization.

190198381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 40.

The square root of 190198381 is about 13791.2429099048. The cubic root of 190198381 is about 575.0897210972.

The spelling of 190198381 in words is "one hundred ninety million, one hundred ninety-eight thousand, three hundred eighty-one".