51143557 has 2 divisors, whose sum is σ = 51143558. Its totient is φ = 51143556.

The previous prime is 51143551. The next prime is 51143593. The reversal of 51143557 is 75534115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35414401 + 15729156 = 5951^2 + 3966^2 .

It is a cyclic number.

It is not a de Polignac number, because 51143557 - 2¹¹ = 51141509 is a prime.

It is a super-2 number, since 2×51143557² = 5231326845224498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51143551) 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 as a sum of consecutive naturals, namely, 25571778 + 25571779.

It is an arithmetic number, because the mean of its divisors is an integer number (25571779).

Almost surely, 2^51143557 is an apocalyptic number.

It is an amenable number.

51143557 is a deficient number, since it is larger than the sum of its proper divisors (1).

51143557 is an equidigital number, since it uses as much as digits as its factorization.

51143557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10500, while the sum is 31.

The square root of 51143557 is about 7151.4723658838. The cubic root of 51143557 is about 371.1906058929.

The spelling of 51143557 in words is "fifty-one million, one hundred forty-three thousand, five hundred fifty-seven".