1995525691 has 4 divisors (see below), whose sum is σ = 1997230984. Its totient is φ = 1993820400.

The previous prime is 1995525683. The next prime is 1995525731. The reversal of 1995525691 is 1965255991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1965255991 = 26309 ⋅74699.

It is a cyclic number.

It is not a de Polignac number, because 1995525691 - 2³ = 1995525683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1995525611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 850890 + ... + 853231.

It is an arithmetic number, because the mean of its divisors is an integer number (499307746).

Almost surely, 2^1995525691 is an apocalyptic number.

1995525691 is a deficient number, since it is larger than the sum of its proper divisors (1705293).

1995525691 is a wasteful number, since it uses less digits than its factorization.

1995525691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705292.

The product of its digits is 1093500, while the sum is 52.

The square root of 1995525691 is about 44671.3072452553. The cubic root of 1995525691 is about 1258.9808023708.

The spelling of 1995525691 in words is "one billion, nine hundred ninety-five million, five hundred twenty-five thousand, six hundred ninety-one".