51003557 has 6 divisors (see below), whose sum is σ = 56061894. Its totient is φ = 46366760.

The previous prime is 51003551. The next prime is 51003559. The reversal of 51003557 is 75530015.

It can be written as a sum of positive squares in only one way, i.e., 45616516 + 5387041 = 6754^2 + 2321^2 .

It is not a de Polignac number, because 51003557 - 2⁴ = 51003541 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 (51003551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 210638 + ... + 210879.

It is an arithmetic number, because the mean of its divisors is an integer number (9343649).

Almost surely, 2^51003557 is an apocalyptic number.

It is an amenable number.

51003557 is a deficient number, since it is larger than the sum of its proper divisors (5058337).

51003557 is a wasteful number, since it uses less digits than its factorization.

51003557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421539 (or 421528 counting only the distinct ones).

The product of its (nonzero) digits is 2625, while the sum is 26.

The square root of 51003557 is about 7141.6774640136. The cubic root of 51003557 is about 370.8515982195.

The spelling of 51003557 in words is "fifty-one million, three thousand, five hundred fifty-seven".