8131820025 has 96 divisors (see below), whose sum is σ = 16122904576. Its totient is φ = 3538080000.

The previous prime is 8131819859. The next prime is 8131820029. The reversal of 8131820025 is 5200281318.

It is not a de Polignac number, because 8131820025 - 2⁹ = 8131819513 is a prime.

It is a super-2 number, since 2×8131820025² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 8131819974 and 8131820001.

It is not an unprimeable number, because it can be changed into a prime (8131820029) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 988680 + ... + 996870.

Almost surely, 2^8131820025 is an apocalyptic number.

It is an amenable number.

8131820025 is a deficient number, since it is larger than the sum of its proper divisors (7991084551).

8131820025 is a wasteful number, since it uses less digits than its factorization.

8131820025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8303 (or 8298 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 8131820025 is about 90176.6046433331. The cubic root of 8131820025 is about 2010.9252132711.

The spelling of 8131820025 in words is "eight billion, one hundred thirty-one million, eight hundred twenty thousand, twenty-five".