891067020109 has 4 divisors (see below), whose sum is σ = 1018362308704. Its totient is φ = 763771731516.

The previous prime is 891067020061. The next prime is 891067020223. The reversal of 891067020109 is 901020760198.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 891067020109 - 2¹⁵ = 891066987341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891067120109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63647644287 + ... + 63647644300.

It is an arithmetic number, because the mean of its divisors is an integer number (254590577176).

Almost surely, 2^891067020109 is an apocalyptic number.

It is an amenable number.

891067020109 is a deficient number, since it is larger than the sum of its proper divisors (127295288595).

891067020109 is a wasteful number, since it uses less digits than its factorization.

891067020109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127295288594.

The product of its (nonzero) digits is 54432, while the sum is 43.

The spelling of 891067020109 in words is "eight hundred ninety-one billion, sixty-seven million, twenty thousand, one hundred nine".