61005537 has 12 divisors (see below), whose sum is σ = 93302820. Its totient is φ = 38277888.

The previous prime is 61005487. The next prime is 61005541. The reversal of 61005537 is 73550016.

61005537 is a `hidden beast` number, since 6 + 100 + 553 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16329681 + 44675856 = 4041^2 + 6684^2 .

It is not a de Polignac number, because 61005537 - 2¹⁰ = 61004513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61005537.

It is not an unprimeable number, because it can be changed into a prime (61005557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 199212 + ... + 199517.

It is an arithmetic number, because the mean of its divisors is an integer number (7775235).

Almost surely, 2^61005537 is an apocalyptic number.

It is an amenable number.

61005537 is a deficient number, since it is larger than the sum of its proper divisors (32297283).

61005537 is a wasteful number, since it uses less digits than its factorization.

61005537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398752 (or 398749 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 27.

The square root of 61005537 is about 7810.6041379653. The cubic root of 61005537 is about 393.6616285427.

The spelling of 61005537 in words is "sixty-one million, five thousand, five hundred thirty-seven".