1995687839231 has 8 divisors (see below), whose sum is σ = 2006174302704. Its totient is φ = 1985204972800.

The previous prime is 1995687839087. The next prime is 1995687839239. The reversal of 1995687839231 is 1329387865991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1995687839231 is a prime.

It is a super-2 number, since 2×1995687839231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1995687839239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216911 + ... + 2009583.

It is an arithmetic number, because the mean of its divisors is an integer number (250771787838).

Almost surely, 2^{1995687839231} is an apocalyptic number.

1995687839231 is a deficient number, since it is larger than the sum of its proper divisors (10486463473).

1995687839231 is a wasteful number, since it uses less digits than its factorization.

1995687839231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798521.

The product of its digits is 176359680, while the sum is 71.

The spelling of 1995687839231 in words is "one trillion, nine hundred ninety-five billion, six hundred eighty-seven million, eight hundred thirty-nine thousand, two hundred thirty-one".