61949139 has 32 divisors (see below), whose sum is σ = 105223680. Its totient is φ = 31560192.

The previous prime is 61949117. The next prime is 61949161. The reversal of 61949139 is 93194916.

61949139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61949117) and next prime (61949161).

It is not a de Polignac number, because 61949139 - 2⁷ = 61949011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61949139.

It is not an unprimeable number, because it can be changed into a prime (61949639) 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 31 ways as a sum of consecutive naturals, for example, 2217 + ... + 11349.

It is an arithmetic number, because the mean of its divisors is an integer number (3288240).

Almost surely, 2^61949139 is an apocalyptic number.

61949139 is a deficient number, since it is larger than the sum of its proper divisors (43274541).

61949139 is a wasteful number, since it uses less digits than its factorization.

61949139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9179.

The product of its digits is 52488, while the sum is 42.

The square root of 61949139 is about 7870.7775346531. Note that the first 3 decimals coincide. The cubic root of 61949139 is about 395.6809043037.

The spelling of 61949139 in words is "sixty-one million, nine hundred forty-nine thousand, one hundred thirty-nine".