1881000025 has 6 divisors (see below), whose sum is σ = 2332440062. Its totient is φ = 1504800000.

The previous prime is 1881000013. The next prime is 1881000031. The reversal of 1881000025 is 5200001881.

It can be written as a sum of positive squares in 3 ways, for example, as 72114064 + 1808885961 = 8492^2 + 42531^2 .

It is not a de Polignac number, because 1881000025 - 2⁵ = 1880999993 is a prime.

It is a super-2 number, since 2×1881000025² = 7076322188100001250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 75240001 = 1881000025 / (1 + 8 + 8 + 1 + 0 + 0 + 0 + 0 + 2 + 5).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37619976 + ... + 37620025.

Almost surely, 2^1881000025 is an apocalyptic number.

It is an amenable number.

1881000025 is a deficient number, since it is larger than the sum of its proper divisors (451440037).

1881000025 is an equidigital number, since it uses as much as digits as its factorization.

1881000025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75240011 (or 75240006 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 1881000025 is about 43370.4971726172. The cubic root of 1881000025 is about 1234.4199552286.

The spelling of 1881000025 in words is "one billion, eight hundred eighty-one million, twenty-five", and thus it is an aban number.