891129563 has 2 divisors, whose sum is σ = 891129564. Its totient is φ = 891129562.

The previous prime is 891129557. The next prime is 891129581. The reversal of 891129563 is 365921198.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 891129563 - 2²⁶ = 824020699 is a prime.

It is a super-2 number, since 2×891129563² = 1588223796105141938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (891129163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445564781 + 445564782.

It is an arithmetic number, because the mean of its divisors is an integer number (445564782).

Almost surely, 2^891129563 is an apocalyptic number.

891129563 is a deficient number, since it is larger than the sum of its proper divisors (1).

891129563 is an equidigital number, since it uses as much as digits as its factorization.

891129563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 44.

The square root of 891129563 is about 29851.7932962159. The cubic root of 891129563 is about 962.3069384632.

The spelling of 891129563 in words is "eight hundred ninety-one million, one hundred twenty-nine thousand, five hundred sixty-three".