889778431 has 2 divisors, whose sum is σ = 889778432. Its totient is φ = 889778430.

The previous prime is 889778423. The next prime is 889778447. The reversal of 889778431 is 134877988.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 889778431 - 2³ = 889778423 is a prime.

It is a super-3 number, since 3×889778431³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (889778401) 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, 444889215 + 444889216.

It is an arithmetic number, because the mean of its divisors is an integer number (444889216).

Almost surely, 2^889778431 is an apocalyptic number.

889778431 is a deficient number, since it is larger than the sum of its proper divisors (1).

889778431 is an equidigital number, since it uses as much as digits as its factorization.

889778431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2709504, while the sum is 55.

The square root of 889778431 is about 29829.1540443238. The cubic root of 889778431 is about 961.8203420392.

The spelling of 889778431 in words is "eight hundred eighty-nine million, seven hundred seventy-eight thousand, four hundred thirty-one".