191996531 has 2 divisors, whose sum is σ = 191996532. Its totient is φ = 191996530.

The previous prime is 191996527. The next prime is 191996543. The reversal of 191996531 is 135699191.

It is a weak prime.

It is an emirp because it is prime and its reverse (135699191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191996531 - 2² = 191996527 is a prime.

It is a super-2 number, since 2×191996531² = 73725335832067922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (191992531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95998265 + 95998266.

It is an arithmetic number, because the mean of its divisors is an integer number (95998266).

Almost surely, 2^191996531 is an apocalyptic number.

191996531 is a deficient number, since it is larger than the sum of its proper divisors (1).

191996531 is an equidigital number, since it uses as much as digits as its factorization.

191996531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65610, while the sum is 44.

The square root of 191996531 is about 13856.2812832304. The cubic root of 191996531 is about 576.8963536828.

The spelling of 191996531 in words is "one hundred ninety-one million, nine hundred ninety-six thousand, five hundred thirty-one".