1081616279 has 4 divisors (see below), whose sum is σ = 1145240784. Its totient is φ = 1017991776.

The previous prime is 1081616267. The next prime is 1081616293. The reversal of 1081616279 is 9726161801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9726161801 = 80341 ⋅121061.

It is a cyclic number.

It is not a de Polignac number, because 1081616279 - 2²⁰ = 1080567703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081616299) 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, 31812227 + ... + 31812260.

It is an arithmetic number, because the mean of its divisors is an integer number (286310196).

Almost surely, 2^1081616279 is an apocalyptic number.

1081616279 is a deficient number, since it is larger than the sum of its proper divisors (63624505).

1081616279 is an equidigital number, since it uses as much as digits as its factorization.

1081616279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63624504.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 1081616279 is about 32887.9351586566. The cubic root of 1081616279 is about 1026.4971273825.

The spelling of 1081616279 in words is "one billion, eighty-one million, six hundred sixteen thousand, two hundred seventy-nine".