51881405 has 8 divisors (see below), whose sum is σ = 62748672. Its totient is φ = 41177808.

The previous prime is 51881387. The next prime is 51881413. The reversal of 51881405 is 50418815.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51881405 - 2⁸ = 51881149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40217 + ... + 41486.

It is an arithmetic number, because the mean of its divisors is an integer number (7843584).

Almost surely, 2^51881405 is an apocalyptic number.

It is an amenable number.

51881405 is a deficient number, since it is larger than the sum of its proper divisors (10867267).

51881405 is a wasteful number, since it uses less digits than its factorization.

51881405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81835.

The product of its (nonzero) digits is 6400, while the sum is 32.

The square root of 51881405 is about 7202.8747733110. The cubic root of 51881405 is about 372.9671451007.

The spelling of 51881405 in words is "fifty-one million, eight hundred eighty-one thousand, four hundred five".