10891742447 has 4 divisors (see below), whose sum is σ = 11123481696. Its totient is φ = 10660003200.

The previous prime is 10891742443. The next prime is 10891742467. The reversal of 10891742447 is 74424719801.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10891742447 - 2² = 10891742443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 231739201 = 10891742447 / (1 + 0 + 8 + 9 + 1 + 7 + 4 + 2 + 4 + 4 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10891742441) 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, 115869554 + ... + 115869647.

It is an arithmetic number, because the mean of its divisors is an integer number (2780870424).

Almost surely, 2^10891742447 is an apocalyptic number.

10891742447 is a deficient number, since it is larger than the sum of its proper divisors (231739249).

10891742447 is an equidigital number, since it uses as much as digits as its factorization.

10891742447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231739248.

The product of its (nonzero) digits is 451584, while the sum is 47.

The spelling of 10891742447 in words is "ten billion, eight hundred ninety-one million, seven hundred forty-two thousand, four hundred forty-seven".