61801729 has 8 divisors (see below), whose sum is σ = 69242688. Its totient is φ = 54664560.

The previous prime is 61801721. The next prime is 61801777. The reversal of 61801729 is 92710816.

It is a happy number.

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 61801729 - 2³ = 61801721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61801694 and 61801703.

It is not an unprimeable number, because it can be changed into a prime (61801721) 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 7 ways as a sum of consecutive naturals, for example, 75517 + ... + 76330.

It is an arithmetic number, because the mean of its divisors is an integer number (8655336).

Almost surely, 2^61801729 is an apocalyptic number.

It is an amenable number.

61801729 is a deficient number, since it is larger than the sum of its proper divisors (7440959).

61801729 is a wasteful number, since it uses less digits than its factorization.

61801729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151895.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 61801729 is about 7861.4075711669. The cubic root of 61801729 is about 395.3668098265.

The spelling of 61801729 in words is "sixty-one million, eight hundred one thousand, seven hundred twenty-nine".