891517043425 has 12 divisors (see below), whose sum is σ = 1170509436396. Its totient is φ = 671259891200.

The previous prime is 891517043419. The next prime is 891517043479. The reversal of 891517043425 is 524340715198.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 27598844641 + 863918198784 = 166129^2 + 929472^2 .

It is not a de Polignac number, because 891517043425 - 2⁷ = 891517043297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1048843156 + ... + 1048844005.

It is an arithmetic number, because the mean of its divisors is an integer number (97542453033).

Almost surely, 2^891517043425 is an apocalyptic number.

891517043425 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

891517043425 is a deficient number, since it is larger than the sum of its proper divisors (278992392971).

891517043425 is a wasteful number, since it uses less digits than its factorization.

891517043425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097687188 (or 2097687183 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 49.

The spelling of 891517043425 in words is "eight hundred ninety-one billion, five hundred seventeen million, forty-three thousand, four hundred twenty-five".