1081279643 has 4 divisors (see below), whose sum is σ = 1081437480. Its totient is φ = 1081121808.

The previous prime is 1081279631. The next prime is 1081279669. The reversal of 1081279643 is 3469721801.

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 1081279643 - 2⁴ = 1081279627 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1081279643.

It is not an unprimeable number, because it can be changed into a prime (1081279343) 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, 68153 + ... + 82506.

It is an arithmetic number, because the mean of its divisors is an integer number (270359370).

Almost surely, 2^1081279643 is an apocalyptic number.

1081279643 is a deficient number, since it is larger than the sum of its proper divisors (157837).

1081279643 is an equidigital number, since it uses as much as digits as its factorization.

1081279643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157836.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 1081279643 is about 32882.8168349368. The cubic root of 1081279643 is about 1026.3906226546.

The spelling of 1081279643 in words is "one billion, eighty-one million, two hundred seventy-nine thousand, six hundred forty-three".