51071557 has 4 divisors (see below), whose sum is σ = 51087916. Its totient is φ = 51055200.

The previous prime is 51071483. The next prime is 51071611. The reversal of 51071557 is 75517015.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2643876 + 48427681 = 1626^2 + 6959^2 .

It is a cyclic number.

It is not a de Polignac number, because 51071557 - 2⁷ = 51071429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51071857) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1878 + ... + 10279.

It is an arithmetic number, because the mean of its divisors is an integer number (12771979).

Almost surely, 2^51071557 is an apocalyptic number.

It is an amenable number.

51071557 is a deficient number, since it is larger than the sum of its proper divisors (16359).

51071557 is a wasteful number, since it uses less digits than its factorization.

51071557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16358.

The product of its (nonzero) digits is 6125, while the sum is 31.

The square root of 51071557 is about 7146.4366645203. The cubic root of 51071557 is about 371.0163364670.

The spelling of 51071557 in words is "fifty-one million, seventy-one thousand, five hundred fifty-seven".