1040023958581 has 4 divisors (see below), whose sum is σ = 1040026646412. Its totient is φ = 1040021270752.

The previous prime is 1040023958579. The next prime is 1040023958591. The reversal of 1040023958581 is 1858593200401.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 232198696900 + 807825261681 = 481870^2 + 898791^2 .

It is a cyclic number.

It is not a de Polignac number, because 1040023958581 - 2¹ = 1040023958579 is a prime.

It is a super-2 number, since 2×1040023958581² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040023958591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640936 + ... + 1578241.

It is an arithmetic number, because the mean of its divisors is an integer number (260006661603).

Almost surely, 2^{1040023958581} is an apocalyptic number.

It is an amenable number.

1040023958581 is a deficient number, since it is larger than the sum of its proper divisors (2687831).

1040023958581 is an equidigital number, since it uses as much as digits as its factorization.

1040023958581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2687830.

The product of its (nonzero) digits is 345600, while the sum is 46.

The spelling of 1040023958581 in words is "one trillion, forty billion, twenty-three million, nine hundred fifty-eight thousand, five hundred eighty-one".