191431 has 4 divisors (see below), whose sum is σ = 195552. Its totient is φ = 187312.

The previous prime is 191413. The next prime is 191441. The reversal of 191431 is 134191.

It is a happy number.

191431 is nontrivially palindromic in base 13.

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 191431 - 2¹⁵ = 158663 is a prime.

It is a super-2 number, since 2×191431² = 73291655522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 191399 and 191408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191441) 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, 1990 + ... + 2083.

It is an arithmetic number, because the mean of its divisors is an integer number (48888).

2¹⁹¹⁴³¹ is an apocalyptic number.

191431 is a deficient number, since it is larger than the sum of its proper divisors (4121).

191431 is an equidigital number, since it uses as much as digits as its factorization.

191431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4120.

The product of its digits is 108, while the sum is 19.

The square root of 191431 is about 437.5282848000. The cubic root of 191431 is about 57.6329375338.

The spelling of 191431 in words is "one hundred ninety-one thousand, four hundred thirty-one".