61161609 has 16 divisors (see below), whose sum is σ = 86328000. Its totient is φ = 38450496.

The previous prime is 61161599. The next prime is 61161613. The reversal of 61161609 is 90616116.

It is a happy number.

It is not a de Polignac number, because 61161609 - 2⁴ = 61161593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61161619) 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, 4434 + ... + 11915.

It is an arithmetic number, because the mean of its divisors is an integer number (5395500).

Almost surely, 2^61161609 is an apocalyptic number.

It is an amenable number.

61161609 is a deficient number, since it is larger than the sum of its proper divisors (25166391).

61161609 is a wasteful number, since it uses less digits than its factorization.

61161609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16424.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 61161609 is about 7820.5887885760. The cubic root of 61161609 is about 393.9970474840.

The spelling of 61161609 in words is "sixty-one million, one hundred sixty-one thousand, six hundred nine".