891699313 has 2 divisors, whose sum is σ = 891699314. Its totient is φ = 891699312.

The previous prime is 891699301. The next prime is 891699331. The reversal of 891699313 is 313996198.

Together with next prime (891699331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 885181504 + 6517809 = 29752^2 + 2553^2 .

It is a cyclic number.

It is not a de Polignac number, because 891699313 - 2¹⁷ = 891568241 is a prime.

It is not a weakly prime, because it can be changed into another prime (891699343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445849656 + 445849657.

It is an arithmetic number, because the mean of its divisors is an integer number (445849657).

Almost surely, 2^891699313 is an apocalyptic number.

It is an amenable number.

891699313 is a deficient number, since it is larger than the sum of its proper divisors (1).

891699313 is an equidigital number, since it uses as much as digits as its factorization.

891699313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 49.

The square root of 891699313 is about 29861.3347491367. The cubic root of 891699313 is about 962.5119806908.

The spelling of 891699313 in words is "eight hundred ninety-one million, six hundred ninety-nine thousand, three hundred thirteen".