61611505 has 4 divisors (see below), whose sum is σ = 73933812. Its totient is φ = 49289200.

The previous prime is 61611499. The next prime is 61611521. The reversal of 61611505 is 50511616.

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 38638656 + 22972849 = 6216^2 + 4793^2 .

It is not a de Polignac number, because 61611505 - 2³ = 61611497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61611505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6161146 + ... + 6161155.

It is an arithmetic number, because the mean of its divisors is an integer number (18483453).

Almost surely, 2^61611505 is an apocalyptic number.

It is an amenable number.

61611505 is a deficient number, since it is larger than the sum of its proper divisors (12322307).

61611505 is a wasteful number, since it uses less digits than its factorization.

61611505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12322306.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 61611505 is about 7849.2996502873. The cubic root of 61611505 is about 394.9607502527.

It can be divided in two parts, 616 and 11505, that added together give a palindrome (12121).

The spelling of 61611505 in words is "sixty-one million, six hundred eleven thousand, five hundred five".