891871157 has 2 divisors, whose sum is σ = 891871158. Its totient is φ = 891871156.

The previous prime is 891871117. The next prime is 891871171. The reversal of 891871157 is 751178198.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 605110801 + 286760356 = 24599^2 + 16934^2 .

It is a cyclic number.

It is not a de Polignac number, because 891871157 - 2⁶ = 891871093 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891871117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445935578 + 445935579.

It is an arithmetic number, because the mean of its divisors is an integer number (445935579).

Almost surely, 2^891871157 is an apocalyptic number.

It is an amenable number.

891871157 is a deficient number, since it is larger than the sum of its proper divisors (1).

891871157 is an equidigital number, since it uses as much as digits as its factorization.

891871157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 47.

The square root of 891871157 is about 29864.2119768796. The cubic root of 891871157 is about 962.5738069449.

The spelling of 891871157 in words is "eight hundred ninety-one million, eight hundred seventy-one thousand, one hundred fifty-seven".