1081387239 has 4 divisors (see below), whose sum is σ = 1441849656. Its totient is φ = 720924824.

The previous prime is 1081387213. The next prime is 1081387267. The reversal of 1081387239 is 9327831801.

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 1081387239 - 2¹¹ = 1081385191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1081387239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081387039) 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, 180231204 + ... + 180231209.

It is an arithmetic number, because the mean of its divisors is an integer number (360462414).

Almost surely, 2^1081387239 is an apocalyptic number.

1081387239 is a deficient number, since it is larger than the sum of its proper divisors (360462417).

1081387239 is an equidigital number, since it uses as much as digits as its factorization.

1081387239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360462416.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 1081387239 is about 32884.4528462920. The cubic root of 1081387239 is about 1026.4246662261.

The spelling of 1081387239 in words is "one billion, eighty-one million, three hundred eighty-seven thousand, two hundred thirty-nine".