190126991 has 4 divisors (see below), whose sum is σ = 190358832. Its totient is φ = 189895152.

The previous prime is 190126973. The next prime is 190127011. The reversal of 190126991 is 199621091.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 190126991 - 2⁶ = 190126927 is a prime.

It is a super-2 number, since 2×190126991² = 72296545413428162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190126921) 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, 114686 + ... + 116331.

It is an arithmetic number, because the mean of its divisors is an integer number (47589708).

Almost surely, 2^190126991 is an apocalyptic number.

190126991 is a deficient number, since it is larger than the sum of its proper divisors (231841).

190126991 is an equidigital number, since it uses as much as digits as its factorization.

190126991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231840.

The product of its (nonzero) digits is 8748, while the sum is 38.

The square root of 190126991 is about 13788.6544303641. The cubic root of 190126991 is about 575.0177597539.

The spelling of 190126991 in words is "one hundred ninety million, one hundred twenty-six thousand, nine hundred ninety-one".