891601349 has 2 divisors, whose sum is σ = 891601350. Its totient is φ = 891601348.

The previous prime is 891601331. The next prime is 891601357. The reversal of 891601349 is 943106198.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 836944900 + 54656449 = 28930^2 + 7393^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-891601349 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891601309) 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, 445800674 + 445800675.

It is an arithmetic number, because the mean of its divisors is an integer number (445800675).

Almost surely, 2^891601349 is an apocalyptic number.

It is an amenable number.

891601349 is a deficient number, since it is larger than the sum of its proper divisors (1).

891601349 is an equidigital number, since it uses as much as digits as its factorization.

891601349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 891601349 is about 29859.6943889250. The cubic root of 891601349 is about 962.4767315227.

It can be divided in two parts, 89160 and 1349, that added together give a palindrome (90509).

The spelling of 891601349 in words is "eight hundred ninety-one million, six hundred one thousand, three hundred forty-nine".