191612893 has 2 divisors, whose sum is σ = 191612894. Its totient is φ = 191612892.

The previous prime is 191612881. The next prime is 191612903. The reversal of 191612893 is 398216191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181360089 + 10252804 = 13467^2 + 3202^2 .

It is a cyclic number.

It is not a de Polignac number, because 191612893 - 2¹³ = 191604701 is a prime.

It is equal to p_10639795 and since 191612893 and 10639795 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191612693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95806446 + 95806447.

It is an arithmetic number, because the mean of its divisors is an integer number (95806447).

Almost surely, 2^191612893 is an apocalyptic number.

It is an amenable number.

191612893 is a deficient number, since it is larger than the sum of its proper divisors (1).

191612893 is an equidigital number, since it uses as much as digits as its factorization.

191612893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 40.

The square root of 191612893 is about 13842.4308920074. The cubic root of 191612893 is about 576.5118555257.

The spelling of 191612893 in words is "one hundred ninety-one million, six hundred twelve thousand, eight hundred ninety-three".