1995231671 has 2 divisors, whose sum is σ = 1995231672. Its totient is φ = 1995231670.

The previous prime is 1995231661. The next prime is 1995231727. The reversal of 1995231671 is 1761325991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1995231671 - 2⁶ = 1995231607 is a prime.

It is a super-2 number, since 2×1995231671² = 7961898841922904482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1995231611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997615835 + 997615836.

It is an arithmetic number, because the mean of its divisors is an integer number (997615836).

Almost surely, 2^1995231671 is an apocalyptic number.

1995231671 is a deficient number, since it is larger than the sum of its proper divisors (1).

1995231671 is an equidigital number, since it uses as much as digits as its factorization.

1995231671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102060, while the sum is 44.

The square root of 1995231671 is about 44668.0161972748. The cubic root of 1995231671 is about 1258.9189667488.

The spelling of 1995231671 in words is "one billion, nine hundred ninety-five million, two hundred thirty-one thousand, six hundred seventy-one".