891742731 has 32 divisors (see below), whose sum is σ = 1325654016. Its totient is φ = 528660000.

The previous prime is 891742723. The next prime is 891742741. The reversal of 891742731 is 137247198.

891742731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 891742731 - 2³ = 891742723 is a prime.

It is a super-2 number, since 2×891742731² = 1590410196582676722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (891742711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 332526 + ... + 335196.

It is an arithmetic number, because the mean of its divisors is an integer number (41426688).

Almost surely, 2^891742731 is an apocalyptic number.

891742731 is a deficient number, since it is larger than the sum of its proper divisors (433911285).

891742731 is a wasteful number, since it uses less digits than its factorization.

891742731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2903.

The product of its digits is 84672, while the sum is 42.

The square root of 891742731 is about 29862.0617339125. The cubic root of 891742731 is about 962.5276024242.

The spelling of 891742731 in words is "eight hundred ninety-one million, seven hundred forty-two thousand, seven hundred thirty-one".