1081540639 has 2 divisors, whose sum is σ = 1081540640. Its totient is φ = 1081540638.

The previous prime is 1081540633. The next prime is 1081540717. The reversal of 1081540639 is 9360451801.

It is a weak prime.

It is an emirp because it is prime and its reverse (9360451801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1081540639 - 2⁹ = 1081540127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1081540598 and 1081540607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1081540633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540770319 + 540770320.

It is an arithmetic number, because the mean of its divisors is an integer number (540770320).

Almost surely, 2^1081540639 is an apocalyptic number.

1081540639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081540639 is an equidigital number, since it uses as much as digits as its factorization.

1081540639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 1081540639 is about 32886.7851727711. The cubic root of 1081540639 is about 1026.4731983625.

The spelling of 1081540639 in words is "one billion, eighty-one million, five hundred forty thousand, six hundred thirty-nine".