191406533 has 2 divisors, whose sum is σ = 191406534. Its totient is φ = 191406532.

The previous prime is 191406517. The next prime is 191406541. The reversal of 191406533 is 335604191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140968129 + 50438404 = 11873^2 + 7102^2 .

It is a cyclic number.

It is not a de Polignac number, because 191406533 - 2⁴ = 191406517 is a prime.

It is a super-5 number, since 5×191406533⁵ (a number of 43 digits) contains 55555 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191406533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191406503) 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 as a sum of consecutive naturals, namely, 95703266 + 95703267.

It is an arithmetic number, because the mean of its divisors is an integer number (95703267).

Almost surely, 2^191406533 is an apocalyptic number.

It is an amenable number.

191406533 is a deficient number, since it is larger than the sum of its proper divisors (1).

191406533 is an equidigital number, since it uses as much as digits as its factorization.

191406533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 191406533 is about 13834.9749909423. The cubic root of 191406533 is about 576.3048205351.

The spelling of 191406533 in words is "one hundred ninety-one million, four hundred six thousand, five hundred thirty-three".