891514921 has 8 divisors (see below), whose sum is σ = 984873600. Its totient is φ = 800208240.

The previous prime is 891514919. The next prime is 891514927. The reversal of 891514921 is 129415198.

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

It is a cyclic number.

It is not a de Polignac number, because 891514921 - 2¹ = 891514919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891514927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512086 + ... + 513823.

It is an arithmetic number, because the mean of its divisors is an integer number (123109200).

Almost surely, 2^891514921 is an apocalyptic number.

It is an amenable number.

891514921 is a deficient number, since it is larger than the sum of its proper divisors (93358679).

891514921 is a wasteful number, since it uses less digits than its factorization.

891514921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025999.

The product of its digits is 25920, while the sum is 40.

The square root of 891514921 is about 29858.2471186773. The cubic root of 891514921 is about 962.4456310662.

The spelling of 891514921 in words is "eight hundred ninety-one million, five hundred fourteen thousand, nine hundred twenty-one".