191434261 has 4 divisors (see below), whose sum is σ = 191462400. Its totient is φ = 191406124.

The previous prime is 191434259. The next prime is 191434273. The reversal of 191434261 is 162434191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 191434261 - 2¹ = 191434259 is a prime.

It is a super-2 number, since 2×191434261² = 73294152569232242, 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 (191434211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3210 + ... + 19828.

It is an arithmetic number, because the mean of its divisors is an integer number (47865600).

Almost surely, 2^191434261 is an apocalyptic number.

It is an amenable number.

191434261 is a deficient number, since it is larger than the sum of its proper divisors (28139).

191434261 is a wasteful number, since it uses less digits than its factorization.

191434261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28138.

The product of its digits is 5184, while the sum is 31.

The square root of 191434261 is about 13835.9770525973. The cubic root of 191434261 is about 576.3326478829.

The spelling of 191434261 in words is "one hundred ninety-one million, four hundred thirty-four thousand, two hundred sixty-one".