61522609 has 6 divisors (see below), whose sum is σ = 65354774. Its totient is φ = 57903360.

The previous prime is 61522607. The next prime is 61522619. The reversal of 61522609 is 90622516.

61522609 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 3 ways, for example, as 22771984 + 38750625 = 4772^2 + 6225^2 .

It is not a de Polignac number, because 61522609 - 2¹ = 61522607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61522603) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 106152 + ... + 106729.

Almost surely, 2^61522609 is an apocalyptic number.

It is an amenable number.

61522609 is a deficient number, since it is larger than the sum of its proper divisors (3832165).

61522609 is a wasteful number, since it uses less digits than its factorization.

61522609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212915 (or 212898 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 61522609 is about 7843.6349354110. The cubic root of 61522609 is about 394.7707027892.

The spelling of 61522609 in words is "sixty-one million, five hundred twenty-two thousand, six hundred nine".