891738373761 has 27 divisors (see below), whose sum is σ = 1359509628321. Its totient is φ = 563169187944.

The previous prime is 891738373733. The next prime is 891738373777. The reversal of 891738373761 is 167373837198.

The square root of 891738373761 is 944319.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 891738373761 - 2³⁷ = 754299420289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (891738378761) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 53817900 + ... + 53834466.

Almost surely, 2^891738373761 is an apocalyptic number.

891738373761 is the 944319-th square number.

891738373761 is the 472160-th centered octagonal number.

It is an amenable number.

891738373761 is a deficient number, since it is larger than the sum of its proper divisors (467771254560).

891738373761 is an frugal number, since it uses more digits than its factorization.

891738373761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33178 (or 16589 counting only the distinct ones).

The product of its digits is 32006016, while the sum is 63.

The spelling of 891738373761 in words is "eight hundred ninety-one billion, seven hundred thirty-eight million, three hundred seventy-three thousand, seven hundred sixty-one".