36501561 has 12 divisors (see below), whose sum is σ = 52880100. Its totient is φ = 24262560.

The previous prime is 36501557. The next prime is 36501571. The reversal of 36501561 is 16510563.

It is a happy number.

36501561 is a `hidden beast` number, since 3 + 650 + 1 + 5 + 6 + 1 = 666.

36501561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13461561 + 23040000 = 3669^2 + 4800^2 .

It is not a de Polignac number, because 36501561 - 2² = 36501557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (36501541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2670 + ... + 8951.

It is an arithmetic number, because the mean of its divisors is an integer number (4406675).

Almost surely, 2^36501561 is an apocalyptic number.

It is an amenable number.

36501561 is a deficient number, since it is larger than the sum of its proper divisors (16378539).

36501561 is a wasteful number, since it uses less digits than its factorization.

36501561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11976 (or 11973 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 36501561 is about 6041.6521746953. The cubic root of 36501561 is about 331.7191005991.

The spelling of 36501561 in words is "thirty-six million, five hundred one thousand, five hundred sixty-one".