891262157 has 2 divisors, whose sum is σ = 891262158. Its totient is φ = 891262156.

The previous prime is 891262147. The next prime is 891262159. The reversal of 891262157 is 751262198.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 891261316 + 841 = 29854^2 + 29^2 .

It is a cyclic number.

It is not a de Polignac number, because 891262157 - 2²⁰ = 890213581 is a prime.

Together with 891262159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891262159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445631078 + 445631079.

It is an arithmetic number, because the mean of its divisors is an integer number (445631079).

Almost surely, 2^891262157 is an apocalyptic number.

It is an amenable number.

891262157 is a deficient number, since it is larger than the sum of its proper divisors (1).

891262157 is an equidigital number, since it uses as much as digits as its factorization.

891262157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 41.

The square root of 891262157 is about 29854.0140852114. The cubic root of 891262157 is about 962.3546643322.

Adding to 891262157 its sum of digits (41), we get a palindrome (891262198).

The spelling of 891262157 in words is "eight hundred ninety-one million, two hundred sixty-two thousand, one hundred fifty-seven".