61685537 has 4 divisors (see below), whose sum is σ = 65314116. Its totient is φ = 58056960.

The previous prime is 61685489. The next prime is 61685539. The reversal of 61685537 is 73558616.

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 31259281 + 30426256 = 5591^2 + 5516^2 .

It is a cyclic number.

It is not a de Polignac number, because 61685537 - 2⁶ = 61685473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61685494 and 61685503.

It is not an unprimeable number, because it can be changed into a prime (61685539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1814264 + ... + 1814297.

It is an arithmetic number, because the mean of its divisors is an integer number (16328529).

Almost surely, 2^61685537 is an apocalyptic number.

It is an amenable number.

61685537 is a deficient number, since it is larger than the sum of its proper divisors (3628579).

61685537 is a wasteful number, since it uses less digits than its factorization.

61685537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3628578.

The product of its digits is 151200, while the sum is 41.

The square root of 61685537 is about 7854.0140692515. The cubic root of 61685537 is about 395.1188810577.

The spelling of 61685537 in words is "sixty-one million, six hundred eighty-five thousand, five hundred thirty-seven".