61612505 has 8 divisors (see below), whose sum is σ = 78284232. Its totient is φ = 46390528.

The previous prime is 61612483. The next prime is 61612519. The reversal of 61612505 is 50521616.

61612505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 19829209 + 41783296 = 4453^2 + 6464^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61612505 is a prime.

It is a super-2 number, since 2×61612505² = 7592201544750050, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362342 + ... + 362511.

It is an arithmetic number, because the mean of its divisors is an integer number (9785529).

Almost surely, 2^61612505 is an apocalyptic number.

It is an amenable number.

61612505 is a deficient number, since it is larger than the sum of its proper divisors (16671727).

61612505 is a wasteful number, since it uses less digits than its factorization.

61612505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724875.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 61612505 is about 7849.3633499794. The cubic root of 61612505 is about 394.9628870755.

The spelling of 61612505 in words is "sixty-one million, six hundred twelve thousand, five hundred five".