61139715 has 64 divisors (see below), whose sum is σ = 123088896. Its totient is φ = 25224192.

The previous prime is 61139677. The next prime is 61139731. The reversal of 61139715 is 51793116.

It is a happy number.

61139715 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61139715 - 2⁸ = 61139459 is a prime.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 63679 + ... + 64631.

It is an arithmetic number, because the mean of its divisors is an integer number (1923264).

Almost surely, 2^61139715 is an apocalyptic number.

61139715 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61139715 is an abundant number, since it is smaller than the sum of its proper divisors (61949181).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61139715 is a wasteful number, since it uses less digits than its factorization.

61139715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028.

The product of its digits is 5670, while the sum is 33.

The square root of 61139715 is about 7819.1888965544. The cubic root of 61139715 is about 393.9500288776.

The spelling of 61139715 in words is "sixty-one million, one hundred thirty-nine thousand, seven hundred fifteen".