191190690 has 48 divisors (see below), whose sum is σ = 502702200. Its totient is φ = 50409216.

The previous prime is 191190661. The next prime is 191190773. The reversal of 191190690 is 96091191.

191190690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 150626529 + 40564161 = 12273^2 + 6369^2 .

It is a super-2 number, since 2×191190690² = 73107759885352200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3925 + ... + 19944.

Almost surely, 2^191190690 is an apocalyptic number.

191190690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

191190690 is an abundant number, since it is smaller than the sum of its proper divisors (311511510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191190690 is a wasteful number, since it uses less digits than its factorization.

191190690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23971 (or 23968 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The square root of 191190690 is about 13827.1721620872. The cubic root of 191190690 is about 576.0881122439.

The spelling of 191190690 in words is "one hundred ninety-one million, one hundred ninety thousand, six hundred ninety".