61561213 has 8 divisors (see below), whose sum is σ = 72072000. Its totient is φ = 51479520.

The previous prime is 61561193. The next prime is 61561219. The reversal of 61561213 is 31216516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61561213 - 2⁹ = 61560701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61561219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106963 + ... + 107536.

It is an arithmetic number, because the mean of its divisors is an integer number (9009000).

Almost surely, 2^61561213 is an apocalyptic number.

It is an amenable number.

61561213 is a deficient number, since it is larger than the sum of its proper divisors (10510787).

61561213 is a wasteful number, since it uses less digits than its factorization.

61561213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214547.

The product of its digits is 1080, while the sum is 25.

The square root of 61561213 is about 7846.0953983494. The cubic root of 61561213 is about 394.8532553231.

Adding to 61561213 its reverse (31216516), we get a palindrome (92777729).

The spelling of 61561213 in words is "sixty-one million, five hundred sixty-one thousand, two hundred thirteen".