61561242 has 32 divisors (see below), whose sum is σ = 137064960. Its totient is φ = 20481120.

The previous prime is 61561237. The next prime is 61561243. The reversal of 61561242 is 24216516.

61561242 is a `hidden beast` number, since 6 + 1 + 5 + 612 + 42 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (61561243) 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, 45942 + ... + 47262.

It is an arithmetic number, because the mean of its divisors is an integer number (4283280).

Almost surely, 2^61561242 is an apocalyptic number.

61561242 is an abundant number, since it is smaller than the sum of its proper divisors (75503718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61561242 is a wasteful number, since it uses less digits than its factorization.

61561242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195 (or 2189 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 61561242 is about 7846.0972464022. The cubic root of 61561242 is about 394.8533173251.

Adding to 61561242 its reverse (24216516), we get a palindrome (85777758).

The spelling of 61561242 in words is "sixty-one million, five hundred sixty-one thousand, two hundred forty-two".