190949881 has 4 divisors (see below), whose sum is σ = 191232612. Its totient is φ = 190667152.

The previous prime is 190949851. The next prime is 190949911. The reversal of 190949881 is 188949091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 188949091 = 19 ⋅9944689.

It is an interprime number because it is at equal distance from previous prime (190949851) and next prime (190949911).

It can be written as a sum of positive squares in 2 ways, for example, as 151511481 + 39438400 = 12309^2 + 6280^2 .

It is a cyclic number.

It is not a de Polignac number, because 190949881 - 2¹¹ = 190947833 is a prime.

It is a super-2 number, since 2×190949881² = 72923714107828322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190949821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140350 + ... + 141703.

It is an arithmetic number, because the mean of its divisors is an integer number (47808153).

Almost surely, 2^190949881 is an apocalyptic number.

It is an amenable number.

190949881 is a deficient number, since it is larger than the sum of its proper divisors (282731).

190949881 is an equidigital number, since it uses as much as digits as its factorization.

190949881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282730.

The product of its (nonzero) digits is 186624, while the sum is 49.

The square root of 190949881 is about 13818.4616003374. The cubic root of 190949881 is about 575.8461452905.

The spelling of 190949881 in words is "one hundred ninety million, nine hundred forty-nine thousand, eight hundred eighty-one".