61039985 has 8 divisors (see below), whose sum is σ = 73317096. Its totient is φ = 48785920.

The previous prime is 61039967. The next prime is 61039991. The reversal of 61039985 is 58993016.

It can be written as a sum of positive squares in 4 ways, for example, as 4669921 + 56370064 = 2161^2 + 7508^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61039985 - 2¹⁰ = 61038961 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737 + ... + 11073.

It is an arithmetic number, because the mean of its divisors is an integer number (9164637).

Almost surely, 2^61039985 is an apocalyptic number.

It is an amenable number.

61039985 is a deficient number, since it is larger than the sum of its proper divisors (12277111).

61039985 is a wasteful number, since it uses less digits than its factorization.

61039985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11523.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 61039985 is about 7812.8090338879. The cubic root of 61039985 is about 393.7357109117.

The spelling of 61039985 in words is "sixty-one million, thirty-nine thousand, nine hundred eighty-five".