1995231681 has 12 divisors (see below), whose sum is σ = 2883928320. Its totient is φ = 1329265080.

The previous prime is 1995231671. The next prime is 1995231727. The reversal of 1995231681 is 1861325991.

It is not a de Polignac number, because 1995231681 - 2⁶ = 1995231617 is a prime.

It is a super-2 number, since 2×1995231681² = 7961898921732171522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1995231611) 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 11 ways as a sum of consecutive naturals, for example, 59761 + ... + 86958.

It is an arithmetic number, because the mean of its divisors is an integer number (240327360).

Almost surely, 2^1995231681 is an apocalyptic number.

It is an amenable number.

1995231681 is a deficient number, since it is larger than the sum of its proper divisors (888696639).

1995231681 is a wasteful number, since it uses less digits than its factorization.

1995231681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148236 (or 148233 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 1995231681 is about 44668.0163092117. The cubic root of 1995231681 is about 1258.9189688520.

The spelling of 1995231681 in words is "one billion, nine hundred ninety-five million, two hundred thirty-one thousand, six hundred eighty-one".