51581090 has 48 divisors (see below), whose sum is σ = 104340096. Its totient is φ = 18337440.

The previous prime is 51581083. The next prime is 51581129. The reversal of 51581090 is 9018515.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56417 + ... + 57323.

It is an arithmetic number, because the mean of its divisors is an integer number (2173752).

Almost surely, 2^51581090 is an apocalyptic number.

51581090 is an abundant number, since it is smaller than the sum of its proper divisors (52759006).

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

51581090 is a wasteful number, since it uses less digits than its factorization.

51581090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983 (or 972 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 51581090 is about 7181.9976329709. The cubic root of 51581090 is about 372.2461131997.

The spelling of 51581090 in words is "fifty-one million, five hundred eighty-one thousand, ninety".