61217439 has 4 divisors (see below), whose sum is σ = 81623256. Its totient is φ = 40811624.

The previous prime is 61217419. The next prime is 61217441. The reversal of 61217439 is 93471216.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61217439 - 2⁹ = 61216927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61217419) 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, 10202904 + ... + 10202909.

It is an arithmetic number, because the mean of its divisors is an integer number (20405814).

Almost surely, 2^61217439 is an apocalyptic number.

61217439 is a deficient number, since it is larger than the sum of its proper divisors (20405817).

61217439 is a wasteful number, since it uses less digits than its factorization.

61217439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20405816.

The product of its digits is 9072, while the sum is 33.

The square root of 61217439 is about 7824.1573987235. The cubic root of 61217439 is about 394.1168948077.

The spelling of 61217439 in words is "sixty-one million, two hundred seventeen thousand, four hundred thirty-nine".