51681006 has 24 divisors (see below), whose sum is σ = 120589560. Its totient is φ = 15901776.

The previous prime is 51680983. The next prime is 51681011. The reversal of 51681006 is 60018615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110196 + ... + 110663.

It is an arithmetic number, because the mean of its divisors is an integer number (5024565).

Almost surely, 2^51681006 is an apocalyptic number.

51681006 is an abundant number, since it is smaller than the sum of its proper divisors (68908554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51681006 is a wasteful number, since it uses less digits than its factorization.

51681006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220880 (or 220877 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 51681006 is about 7188.9502710757. The cubic root of 51681006 is about 372.4863133268.

The spelling of 51681006 in words is "fifty-one million, six hundred eighty-one thousand, six".