61217313 has 4 divisors (see below), whose sum is σ = 81623088. Its totient is φ = 40811540.

The previous prime is 61217309. The next prime is 61217327. The reversal of 61217313 is 31371216.

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 61217313 - 2² = 61217309 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61217333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10202883 + ... + 10202888.

It is an arithmetic number, because the mean of its divisors is an integer number (20405772).

Almost surely, 2^61217313 is an apocalyptic number.

It is an amenable number.

61217313 is a deficient number, since it is larger than the sum of its proper divisors (20405775).

61217313 is a wasteful number, since it uses less digits than its factorization.

61217313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20405774.

The product of its digits is 756, while the sum is 24.

The square root of 61217313 is about 7824.1493467341. The cubic root of 61217313 is about 394.1166244121.

Adding to 61217313 its reverse (31371216), we get a palindrome (92588529).

The spelling of 61217313 in words is "sixty-one million, two hundred seventeen thousand, three hundred thirteen".