61439871 has 16 divisors (see below), whose sum is σ = 84522368. Its totient is φ = 39679200.

The previous prime is 61439867. The next prime is 61439881. The reversal of 61439871 is 17893416.

It is not a de Polignac number, because 61439871 - 2² = 61439867 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61439881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9756 + ... + 14766.

It is an arithmetic number, because the mean of its divisors is an integer number (5282648).

Almost surely, 2^61439871 is an apocalyptic number.

61439871 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

61439871 is a deficient number, since it is larger than the sum of its proper divisors (23082497).

61439871 is a wasteful number, since it uses less digits than its factorization.

61439871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5142.

The product of its digits is 36288, while the sum is 39.

The square root of 61439871 is about 7838.3589481472. The cubic root of 61439871 is about 394.5936557283.

The spelling of 61439871 in words is "sixty-one million, four hundred thirty-nine thousand, eight hundred seventy-one".