191040231 has 16 divisors (see below), whose sum is σ = 279786240. Its totient is φ = 115410240.

The previous prime is 191040229. The next prime is 191040247. The reversal of 191040231 is 132040191.

It is not a de Polignac number, because 191040231 - 2¹ = 191040229 is a prime.

It is a super-2 number, since 2×191040231² = 72992739721066722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 191040198 and 191040207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191040221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71550 + ... + 74171.

It is an arithmetic number, because the mean of its divisors is an integer number (17486640).

Almost surely, 2^191040231 is an apocalyptic number.

191040231 is a deficient number, since it is larger than the sum of its proper divisors (88746009).

191040231 is a wasteful number, since it uses less digits than its factorization.

191040231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145766.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 191040231 is about 13821.7303909460. The cubic root of 191040231 is about 575.9369535788.

It can be divided in two parts, 191040 and 231, that added together give a triangular number (191271 = T₆₁₈).

The spelling of 191040231 in words is "one hundred ninety-one million, forty thousand, two hundred thirty-one".