61485991 has 8 divisors (see below), whose sum is σ = 74403360. Its totient is φ = 49602048.

The previous prime is 61485961. The next prime is 61485997. The reversal of 61485991 is 19958416.

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

It is a cyclic number.

It is not a de Polignac number, because 61485991 - 2⁵ = 61485959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61485997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258226 + ... + 258463.

It is an arithmetic number, because the mean of its divisors is an integer number (9300420).

Almost surely, 2^61485991 is an apocalyptic number.

61485991 is a deficient number, since it is larger than the sum of its proper divisors (12917369).

61485991 is a wasteful number, since it uses less digits than its factorization.

61485991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516713.

The product of its digits is 77760, while the sum is 43.

The square root of 61485991 is about 7841.3003385918. The cubic root of 61485991 is about 394.6923652871.

The spelling of 61485991 in words is "sixty-one million, four hundred eighty-five thousand, nine hundred ninety-one".