1042687581 has 24 divisors (see below), whose sum is σ = 1507808736. Its totient is φ = 640635840.

The previous prime is 1042687577. The next prime is 1042687601. The reversal of 1042687581 is 1857862401.

It is not a de Polignac number, because 1042687581 - 2² = 1042687577 is a prime.

It is a super-2 number, since 2×1042687581² = 2174394783143263122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1042687531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 431266 + ... + 433676.

It is an arithmetic number, because the mean of its divisors is an integer number (62825364).

Almost surely, 2^1042687581 is an apocalyptic number.

It is an amenable number.

1042687581 is a deficient number, since it is larger than the sum of its proper divisors (465121155).

1042687581 is a wasteful number, since it uses less digits than its factorization.

1042687581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3293 (or 3280 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 42.

The square root of 1042687581 is about 32290.6732819246. The cubic root of 1042687581 is about 1014.0313928479.

The spelling of 1042687581 in words is "one billion, forty-two million, six hundred eighty-seven thousand, five hundred eighty-one".