3520167561 has 9 divisors (see below), whose sum is σ = 5084943591. Its totient is φ = 2346659712.

The previous prime is 3520167559. The next prime is 3520167569. The reversal of 3520167561 is 1657610253.

The square root of 3520167561 is 59331.

It is a perfect power (a square), and thus also a powerful number.

3520167561 is a `hidden beast` number, since 3 + 520 + 1 + 6 + 75 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1641465225 + 1878702336 = 40515^2 + 43344^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 3520167561 - 2¹ = 3520167559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3520167569) 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 8 ways as a sum of consecutive naturals, for example, 168105 + ... + 187881.

Almost surely, 2^3520167561 is an apocalyptic number.

3520167561 is the 59331-st square number.

3520167561 is the 29666-th centered octagonal number.

It is an amenable number.

3520167561 is a deficient number, since it is larger than the sum of its proper divisors (1564776030).

3520167561 is an frugal number, since it uses more digits than its factorization.

3520167561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39560 (or 19780 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The cubic root of 3520167561 is about 1521.2051212896.

Multiplying 3520167561 by its sum of digits (36), we get a square (126726032196 = 355986²).

The spelling of 3520167561 in words is "three billion, five hundred twenty million, one hundred sixty-seven thousand, five hundred sixty-one".