61259985 has 24 divisors (see below), whose sum is σ = 106450344. Its totient is φ = 32590080.

The previous prime is 61259983. The next prime is 61260011. The reversal of 61259985 is 58995216.

It can be written as a sum of positive squares in 4 ways, for example, as 9290304 + 51969681 = 3048^2 + 7209^2 .

It is not a de Polignac number, because 61259985 - 2¹ = 61259983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 61259985.

It is not an unprimeable number, because it can be changed into a prime (61259983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19269 + ... + 22221.

It is an arithmetic number, because the mean of its divisors is an integer number (4435431).

Almost surely, 2^61259985 is an apocalyptic number.

It is an amenable number.

61259985 is a deficient number, since it is larger than the sum of its proper divisors (45190359).

61259985 is a wasteful number, since it uses less digits than its factorization.

61259985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3425 (or 3422 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 61259985 is about 7826.8758135031. The cubic root of 61259985 is about 394.2081771535.

It can be divided in two parts, 6125 and 9985, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 61259985 in words is "sixty-one million, two hundred fifty-nine thousand, nine hundred eighty-five".