51061988 has 24 divisors (see below), whose sum is σ = 90809208. Its totient is φ = 25120256.

The previous prime is 51061957. The next prime is 51062003. The reversal of 51061988 is 88916015.

It can be written as a sum of positive squares in 4 ways, for example, as 1387684 + 49674304 = 1178^2 + 7048^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 77870 + ... + 78522.

It is an arithmetic number, because the mean of its divisors is an integer number (3783717).

Almost surely, 2^51061988 is an apocalyptic number.

It is an amenable number.

51061988 is a deficient number, since it is larger than the sum of its proper divisors (39747220).

51061988 is a wasteful number, since it uses less digits than its factorization.

51061988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943 (or 941 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 51061988 is about 7145.7671386633. The cubic root of 51061988 is about 370.9931632483.

The spelling of 51061988 in words is "fifty-one million, sixty-one thousand, nine hundred eighty-eight".