891146651 has 4 divisors (see below), whose sum is σ = 891835032. Its totient is φ = 890458272.

The previous prime is 891146617. The next prime is 891146657. The reversal of 891146651 is 156641198.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 891146651 - 2²² = 886952347 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 891146599 and 891146608.

It is not an unprimeable number, because it can be changed into a prime (891146657) 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 in 3 ways as a sum of consecutive naturals, for example, 342245 + ... + 344838.

It is an arithmetic number, because the mean of its divisors is an integer number (222958758).

Almost surely, 2^891146651 is an apocalyptic number.

891146651 is a deficient number, since it is larger than the sum of its proper divisors (688381).

891146651 is a wasteful number, since it uses less digits than its factorization.

891146651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688380.

The product of its digits is 51840, while the sum is 41.

The square root of 891146651 is about 29852.0795088047. The cubic root of 891146651 is about 962.3130893817.

The spelling of 891146651 in words is "eight hundred ninety-one million, one hundred forty-six thousand, six hundred fifty-one".