891267421 has 4 divisors (see below), whose sum is σ = 972291744. Its totient is φ = 810243100.

The previous prime is 891267413. The next prime is 891267431. The reversal of 891267421 is 124762198.

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 891267421 - 2³ = 891267413 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 (891267431) 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, 40512145 + ... + 40512166.

It is an arithmetic number, because the mean of its divisors is an integer number (243072936).

Almost surely, 2^891267421 is an apocalyptic number.

It is an amenable number.

891267421 is a deficient number, since it is larger than the sum of its proper divisors (81024323).

891267421 is a wasteful number, since it uses less digits than its factorization.

891267421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81024322.

The product of its digits is 48384, while the sum is 40.

The square root of 891267421 is about 29854.1022474299. The cubic root of 891267421 is about 962.3565589580.

The spelling of 891267421 in words is "eight hundred ninety-one million, two hundred sixty-seven thousand, four hundred twenty-one".