1861131502925 has 12 divisors (see below), whose sum is σ = 2361472903680. Its totient is φ = 1454279499120.

The previous prime is 1861131502891. The next prime is 1861131502939. The reversal of 1861131502925 is 5292051311681.

It is not a de Polignac number, because 1861131502925 - 2⁶ = 1861131502861 is a prime.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 865641485 + ... + 865643634.

It is an arithmetic number, because the mean of its divisors is an integer number (196789408640).

Almost surely, 2^{1861131502925} is an apocalyptic number.

It is an amenable number.

1861131502925 is a deficient number, since it is larger than the sum of its proper divisors (500341400755).

1861131502925 is a wasteful number, since it uses less digits than its factorization.

1861131502925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731285172 (or 1731285167 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 44.

The spelling of 1861131502925 in words is "one trillion, eight hundred sixty-one billion, one hundred thirty-one million, five hundred two thousand, nine hundred twenty-five".