61206505 has 16 divisors (see below), whose sum is σ = 78091200. Its totient is φ = 45921600.

The previous prime is 61206503. The next prime is 61206517. The reversal of 61206505 is 50560216.

It is not a de Polignac number, because 61206505 - 2¹ = 61206503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61206505.

It is not an unprimeable number, because it can be changed into a prime (61206503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6406 + ... + 12784.

It is an arithmetic number, because the mean of its divisors is an integer number (4880700).

Almost surely, 2^61206505 is an apocalyptic number.

It is an amenable number.

61206505 is a deficient number, since it is larger than the sum of its proper divisors (16884695).

61206505 is a wasteful number, since it uses less digits than its factorization.

61206505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6504.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 61206505 is about 7823.4586341336. The cubic root of 61206505 is about 394.0934291047.

The spelling of 61206505 in words is "sixty-one million, two hundred six thousand, five hundred five".