190736881 has 4 divisors (see below), whose sum is σ = 192424932. Its totient is φ = 189048832.

The previous prime is 190736867. The next prime is 190736891. The reversal of 190736881 is 188637091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 188637091 = 563 ⋅335057.

It can be written as a sum of positive squares in 2 ways, for example, as 2608225 + 188128656 = 1615^2 + 13716^2 .

It is a cyclic number.

It is not a de Polignac number, because 190736881 - 2⁵ = 190736849 is a prime.

It is a super-2 number, since 2×190736881² = 72761115547216322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190736891) 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 in 3 ways as a sum of consecutive naturals, for example, 843856 + ... + 844081.

It is an arithmetic number, because the mean of its divisors is an integer number (48106233).

Almost surely, 2^190736881 is an apocalyptic number.

It is an amenable number.

190736881 is a deficient number, since it is larger than the sum of its proper divisors (1688051).

190736881 is a wasteful number, since it uses less digits than its factorization.

190736881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688050.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 190736881 is about 13810.7523690782. The cubic root of 190736881 is about 575.6319514526.

The spelling of 190736881 in words is "one hundred ninety million, seven hundred thirty-six thousand, eight hundred eighty-one".