1000025861 has 8 divisors (see below), whose sum is σ = 1003564224. Its totient is φ = 996494400.

The previous prime is 1000025857. The next prime is 1000025863. The reversal of 1000025861 is 1685200001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1000025861 - 2² = 1000025857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000025863) 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 7 ways as a sum of consecutive naturals, for example, 559976 + ... + 561758.

It is an arithmetic number, because the mean of its divisors is an integer number (125445528).

Almost surely, 2^1000025861 is an apocalyptic number.

It is an amenable number.

1000025861 is a deficient number, since it is larger than the sum of its proper divisors (3538363).

1000025861 is a wasteful number, since it uses less digits than its factorization.

1000025861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3451.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1000025861 is about 31623.1854973530. The cubic root of 1000025861 is about 1000.0086202590.

Adding to 1000025861 its reverse (1685200001), we get a palindrome (2685225862).

The spelling of 1000025861 in words is "one billion, twenty-five thousand, eight hundred sixty-one".