3181552561 has 16 divisors (see below), whose sum is σ = 3608763840. Its totient is φ = 2778354880.

The previous prime is 3181552547. The next prime is 3181552589. The reversal of 3181552561 is 1652551813.

It is a cyclic number.

It is not a de Polignac number, because 3181552561 - 2¹⁷ = 3181421489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3181552561.

It is not an unprimeable number, because it can be changed into a prime (3181552541) 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 15 ways as a sum of consecutive naturals, for example, 37530 + ... + 88156.

It is an arithmetic number, because the mean of its divisors is an integer number (225547740).

Almost surely, 2^3181552561 is an apocalyptic number.

It is an amenable number.

3181552561 is a deficient number, since it is larger than the sum of its proper divisors (427211279).

3181552561 is a wasteful number, since it uses less digits than its factorization.

3181552561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50864.

The product of its digits is 36000, while the sum is 37.

The square root of 3181552561 is about 56405.2529557310. The cubic root of 3181552561 is about 1470.7754344343.

The spelling of 3181552561 in words is "three billion, one hundred eighty-one million, five hundred fifty-two thousand, five hundred sixty-one".