61857601 has 4 divisors (see below), whose sum is σ = 66615892. Its totient is φ = 57099312.

The previous prime is 61857571. The next prime is 61857637. The reversal of 61857601 is 10675816.

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 24354225 + 37503376 = 4935^2 + 6124^2 .

It is a cyclic number.

It is not a de Polignac number, because 61857601 - 2¹¹ = 61855553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61857661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2379126 + ... + 2379151.

It is an arithmetic number, because the mean of its divisors is an integer number (16653973).

Almost surely, 2^61857601 is an apocalyptic number.

It is an amenable number.

61857601 is a deficient number, since it is larger than the sum of its proper divisors (4758291).

61857601 is a wasteful number, since it uses less digits than its factorization.

61857601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4758290.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 61857601 is about 7864.9603304785. The cubic root of 61857601 is about 395.4859180418.

The spelling of 61857601 in words is "sixty-one million, eight hundred fifty-seven thousand, six hundred one".