61086881 has 4 divisors (see below), whose sum is σ = 64302000. Its totient is φ = 57871764.

The previous prime is 61086877. The next prime is 61086913. The reversal of 61086881 is 18868016.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61086881 - 2² = 61086877 is a prime.

It is a super-2 number, since 2×61086881² = 7463214060616322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61086811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1607531 + ... + 1607568.

It is an arithmetic number, because the mean of its divisors is an integer number (16075500).

Almost surely, 2^61086881 is an apocalyptic number.

It is an amenable number.

61086881 is a deficient number, since it is larger than the sum of its proper divisors (3215119).

61086881 is a wasteful number, since it uses less digits than its factorization.

61086881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3215118.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 61086881 is about 7815.8096829439. The cubic root of 61086881 is about 393.8365186212.

The spelling of 61086881 in words is "sixty-one million, eighty-six thousand, eight hundred eighty-one".