891613047 has 16 divisors (see below), whose sum is σ = 1283418080. Its totient is φ = 547333632.

The previous prime is 891613043. The next prime is 891613049. The reversal of 891613047 is 740316198.

It is not a de Polignac number, because 891613047 - 2² = 891613043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 891612996 and 891613014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891613043) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 11998 + ... + 43899.

It is an arithmetic number, because the mean of its divisors is an integer number (80213630).

Almost surely, 2^891613047 is an apocalyptic number.

891613047 is a deficient number, since it is larger than the sum of its proper divisors (391805033).

891613047 is a wasteful number, since it uses less digits than its factorization.

891613047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56322.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 891613047 is about 29859.8902710643. The cubic root of 891613047 is about 962.4809408044.

The spelling of 891613047 in words is "eight hundred ninety-one million, six hundred thirteen thousand, forty-seven".