61500609 has 6 divisors (see below), whose sum is σ = 88834226. Its totient is φ = 41000400.

The previous prime is 61500599. The next prime is 61500629. The reversal of 61500609 is 90600516.

61500609 is a `hidden beast` number, since 6 + 1 + 50 + 0 + 609 = 666.

61500609 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 only one way, i.e., 34751025 + 26749584 = 5895^2 + 5172^2 .

It is not a de Polignac number, because 61500609 - 2²⁰ = 60452033 is a prime.

It is a super-3 number, since 3×61500609³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61500629) 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, 3416692 + ... + 3416709.

Almost surely, 2^61500609 is an apocalyptic number.

It is an amenable number.

61500609 is a deficient number, since it is larger than the sum of its proper divisors (27333617).

61500609 is a wasteful number, since it uses less digits than its factorization.

61500609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6833407 (or 6833404 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 61500609 is about 7842.2323990048. The cubic root of 61500609 is about 394.7236415487.

The spelling of 61500609 in words is "sixty-one million, five hundred thousand, six hundred nine".