61541609 has 4 divisors (see below), whose sum is σ = 61559040. Its totient is φ = 61524180.

The previous prime is 61541587. The next prime is 61541611. The reversal of 61541609 is 90614516.

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 not a de Polignac number, because 61541609 - 2¹² = 61537513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61541699) 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, 1337 + ... + 11174.

It is an arithmetic number, because the mean of its divisors is an integer number (15389760).

Almost surely, 2^61541609 is an apocalyptic number.

It is an amenable number.

61541609 is a deficient number, since it is larger than the sum of its proper divisors (17431).

61541609 is a wasteful number, since it uses less digits than its factorization.

61541609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17430.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 61541609 is about 7844.8460150598. The cubic root of 61541609 is about 394.8113375600.

It can be divided in two parts, 615 and 41609, that added together give a palindrome (42224).

The spelling of 61541609 in words is "sixty-one million, five hundred forty-one thousand, six hundred nine".