61544609 has 4 divisors (see below), whose sum is σ = 70336704. Its totient is φ = 52752516.

The previous prime is 61544603. The next prime is 61544617. The reversal of 61544609 is 90644516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61544609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61544603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4396037 + ... + 4396050.

It is an arithmetic number, because the mean of its divisors is an integer number (17584176).

Almost surely, 2^61544609 is an apocalyptic number.

It is an amenable number.

61544609 is a deficient number, since it is larger than the sum of its proper divisors (8792095).

61544609 is an equidigital number, since it uses as much as digits as its factorization.

61544609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8792094.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 61544609 is about 7845.0372210717. The cubic root of 61544609 is about 394.8177528119.

The spelling of 61544609 in words is "sixty-one million, five hundred forty-four thousand, six hundred nine".