61540533 has 16 divisors (see below), whose sum is σ = 92423040. Its totient is φ = 40463712.

The previous prime is 61540529. The next prime is 61540547. The reversal of 61540533 is 33504516.

61540533 is a `hidden beast` number, since 615 + 40 + 5 + 3 + 3 = 666.

61540533 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61540533 - 2² = 61540529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 61540497 and 61540506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61540553) 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 15 ways as a sum of consecutive naturals, for example, 13641 + ... + 17582.

It is an arithmetic number, because the mean of its divisors is an integer number (5776440).

Almost surely, 2^61540533 is an apocalyptic number.

It is an amenable number.

61540533 is a deficient number, since it is larger than the sum of its proper divisors (30882507).

61540533 is a wasteful number, since it uses less digits than its factorization.

61540533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31305 (or 31299 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 61540533 is about 7844.7774347014. Note that the first 3 decimals coincide. The cubic root of 61540533 is about 394.8090365722.

The spelling of 61540533 in words is "sixty-one million, five hundred forty thousand, five hundred thirty-three".