891438269 has 4 divisors (see below), whose sum is σ = 891501696. Its totient is φ = 891374844.

The previous prime is 891438253. The next prime is 891438281. The reversal of 891438269 is 962834198.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 891438269 - 2⁴ = 891438253 is a prime.

It is a super-2 number, since 2×891438269² = 1589324374875432722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891438169) 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, 179 + ... + 42224.

It is an arithmetic number, because the mean of its divisors is an integer number (222875424).

Almost surely, 2^891438269 is an apocalyptic number.

It is an amenable number.

891438269 is a deficient number, since it is larger than the sum of its proper divisors (63427).

891438269 is a wasteful number, since it uses less digits than its factorization.

891438269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63426.

The product of its digits is 746496, while the sum is 50.

The square root of 891438269 is about 29856.9634926260. The cubic root of 891438269 is about 962.4180467468.

The spelling of 891438269 in words is "eight hundred ninety-one million, four hundred thirty-eight thousand, two hundred sixty-nine".