3969752581 has 4 divisors (see below), whose sum is σ = 4009057164. Its totient is φ = 3930448000.

The previous prime is 3969752573. The next prime is 3969752599. The reversal of 3969752581 is 1852579693.

3969752581 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1952844481 + 2016908100 = 44191^2 + 44910^2 .

It is a cyclic number.

It is not a de Polignac number, because 3969752581 - 2³ = 3969752573 is a prime.

It is a super-2 number, since 2×3969752581² = 31517871108712323122, which 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 (3969752981) 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 3 ways as a sum of consecutive naturals, for example, 19652140 + ... + 19652341.

It is an arithmetic number, because the mean of its divisors is an integer number (1002264291).

Almost surely, 2^3969752581 is an apocalyptic number.

It is an amenable number.

3969752581 is a deficient number, since it is larger than the sum of its proper divisors (39304583).

3969752581 is a wasteful number, since it uses less digits than its factorization.

3969752581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39304582.

The product of its digits is 4082400, while the sum is 55.

The square root of 3969752581 is about 63005.9725819704. The cubic root of 3969752581 is about 1583.3896917434.

The spelling of 3969752581 in words is "three billion, nine hundred sixty-nine million, seven hundred fifty-two thousand, five hundred eighty-one".