61397139 has 8 divisors (see below), whose sum is σ = 82100160. Its totient is φ = 40812776.

The previous prime is 61397137. The next prime is 61397159. The reversal of 61397139 is 93179316.

61397139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 61397139 - 2¹ = 61397137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61397097 and 61397106.

It is not an unprimeable number, because it can be changed into a prime (61397137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28449 + ... + 30530.

It is an arithmetic number, because the mean of its divisors is an integer number (10262520).

Almost surely, 2^61397139 is an apocalyptic number.

61397139 is a deficient number, since it is larger than the sum of its proper divisors (20703021).

61397139 is a wasteful number, since it uses less digits than its factorization.

61397139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59329.

The product of its digits is 30618, while the sum is 39.

The square root of 61397139 is about 7835.6326483571. The cubic root of 61397139 is about 394.5021533293.

The spelling of 61397139 in words is "sixty-one million, three hundred ninety-seven thousand, one hundred thirty-nine".