891997242 has 16 divisors (see below), whose sum is σ = 1888935552. Its totient is φ = 279842240.

The previous prime is 891997241. The next prime is 891997243. The reversal of 891997242 is 242799198.

891997242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (891997241) and next prime (891997243).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (891997241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4372434 + ... + 4372637.

It is an arithmetic number, because the mean of its divisors is an integer number (118058472).

Almost surely, 2^891997242 is an apocalyptic number.

891997242 is an abundant number, since it is smaller than the sum of its proper divisors (996938310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

891997242 is a wasteful number, since it uses less digits than its factorization.

891997242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8745093.

The product of its digits is 653184, while the sum is 51.

The square root of 891997242 is about 29866.3228737654. The cubic root of 891997242 is about 962.6191649164.

The spelling of 891997242 in words is "eight hundred ninety-one million, nine hundred ninety-seven thousand, two hundred forty-two".