1039491581 has 2 divisors, whose sum is σ = 1039491582. Its totient is φ = 1039491580.

The previous prime is 1039491569. The next prime is 1039491599. The reversal of 1039491581 is 1851949301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 597020356 + 442471225 = 24434^2 + 21035^2 .

It is a cyclic number.

It is not a de Polignac number, because 1039491581 - 2⁶ = 1039491517 is a prime.

It is a super-2 number, since 2×1039491581² = 2161085493939759122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1039491281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 519745790 + 519745791.

It is an arithmetic number, because the mean of its divisors is an integer number (519745791).

Almost surely, 2^1039491581 is an apocalyptic number.

It is an amenable number.

1039491581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1039491581 is an equidigital number, since it uses as much as digits as its factorization.

1039491581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 1039491581 is about 32241.1473275999. The cubic root of 1039491581 is about 1012.9942777133.

The spelling of 1039491581 in words is "one billion, thirty-nine million, four hundred ninety-one thousand, five hundred eighty-one".