61043865 has 16 divisors (see below), whose sum is σ = 102811200. Its totient is φ = 30843072.

The previous prime is 61043839. The next prime is 61043881. The reversal of 61043865 is 56834016.

It is not a de Polignac number, because 61043865 - 2¹⁷ = 60912793 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106810 + ... + 107379.

It is an arithmetic number, because the mean of its divisors is an integer number (6425700).

Almost surely, 2^61043865 is an apocalyptic number.

It is an amenable number.

61043865 is a deficient number, since it is larger than the sum of its proper divisors (41767335).

61043865 is a wasteful number, since it uses less digits than its factorization.

61043865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214216.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 61043865 is about 7813.0573401198. The cubic root of 61043865 is about 393.7440533241.

The spelling of 61043865 in words is "sixty-one million, forty-three thousand, eight hundred sixty-five".