3561005381 has 4 divisors (see below), whose sum is σ = 3683798700. Its totient is φ = 3438212064.

The previous prime is 3561005369. The next prime is 3561005387. The reversal of 3561005381 is 1835001653.

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 1553069281 + 2007936100 = 39409^2 + 44810^2 .

It is a cyclic number.

It is not a de Polignac number, because 3561005381 - 2²⁶ = 3493896517 is a prime.

It is a super-2 number, since 2×3561005381² = 25361518647021910322, 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 (3561005387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61396616 + ... + 61396673.

It is an arithmetic number, because the mean of its divisors is an integer number (920949675).

Almost surely, 2^3561005381 is an apocalyptic number.

It is an amenable number.

3561005381 is a deficient number, since it is larger than the sum of its proper divisors (122793319).

3561005381 is a wasteful number, since it uses less digits than its factorization.

3561005381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122793318.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 3561005381 is about 59674.1600778763. The cubic root of 3561005381 is about 1527.0650702552.

The spelling of 3561005381 in words is "three billion, five hundred sixty-one million, five thousand, three hundred eighty-one".