51606881 has 4 divisors (see below), whose sum is σ = 51755952. Its totient is φ = 51457812.

The previous prime is 51606853. The next prime is 51606889. The reversal of 51606881 is 18860615.

51606881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-51606881 is a prime.

It is a super-2 number, since 2×51606881² = 5326540333096322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51606889) 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 3 ways as a sum of consecutive naturals, for example, 74015 + ... + 74708.

It is an arithmetic number, because the mean of its divisors is an integer number (12938988).

Almost surely, 2^51606881 is an apocalyptic number.

It is an amenable number.

51606881 is a deficient number, since it is larger than the sum of its proper divisors (149071).

51606881 is a wasteful number, since it uses less digits than its factorization.

51606881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149070.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 51606881 is about 7183.7929396663. The cubic root of 51606881 is about 372.3081449754.

The spelling of 51606881 in words is "fifty-one million, six hundred six thousand, eight hundred eighty-one".