891522730987 has 8 divisors (see below), whose sum is σ = 1063182387456. Its totient is φ = 730937891112.

The previous prime is 891522730927. The next prime is 891522730991. The reversal of 891522730987 is 789037225198.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-891522730987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (891522730927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2768703973 + ... + 2768704294.

It is an arithmetic number, because the mean of its divisors is an integer number (132897798432).

Almost surely, 2^891522730987 is an apocalyptic number.

891522730987 is a deficient number, since it is larger than the sum of its proper divisors (171659656469).

891522730987 is a wasteful number, since it uses less digits than its factorization.

891522730987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5537408297.

The product of its (nonzero) digits is 15240960, while the sum is 61.

The spelling of 891522730987 in words is "eight hundred ninety-one billion, five hundred twenty-two million, seven hundred thirty thousand, nine hundred eighty-seven".