51236557 has 2 divisors, whose sum is σ = 51236558. Its totient is φ = 51236556.

The previous prime is 51236543. The next prime is 51236567. The reversal of 51236557 is 75563215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50495236 + 741321 = 7106^2 + 861^2 .

It is a cyclic number.

It is not a de Polignac number, because 51236557 - 2¹¹ = 51234509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51236567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25618278 + 25618279.

It is an arithmetic number, because the mean of its divisors is an integer number (25618279).

Almost surely, 2^51236557 is an apocalyptic number.

It is an amenable number.

51236557 is a deficient number, since it is larger than the sum of its proper divisors (1).

51236557 is an equidigital number, since it uses as much as digits as its factorization.

51236557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31500, while the sum is 34.

The square root of 51236557 is about 7157.9715702146. The cubic root of 51236557 is about 371.4154619986.

The spelling of 51236557 in words is "fifty-one million, two hundred thirty-six thousand, five hundred fifty-seven".