61725515 has 8 divisors (see below), whose sum is σ = 75085728. Its totient is φ = 48703680.

The previous prime is 61725493. The next prime is 61725533. The reversal of 61725515 is 51552716.

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

It is not a de Polignac number, because 61725515 - 2¹⁰ = 61724491 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 84191 + ... + 84920.

It is an arithmetic number, because the mean of its divisors is an integer number (9385716).

Almost surely, 2^61725515 is an apocalyptic number.

61725515 is a deficient number, since it is larger than the sum of its proper divisors (13360213).

61725515 is a wasteful number, since it uses less digits than its factorization.

61725515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169189.

The product of its digits is 10500, while the sum is 32.

The square root of 61725515 is about 7856.5587250399. The cubic root of 61725515 is about 395.2042206266.

The spelling of 61725515 in words is "sixty-one million, seven hundred twenty-five thousand, five hundred fifteen".