51858557 has 2 divisors, whose sum is σ = 51858558. Its totient is φ = 51858556.

The previous prime is 51858553. The next prime is 51858589. The reversal of 51858557 is 75585815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51638596 + 219961 = 7186^2 + 469^2 .

It is a cyclic number.

It is not a de Polignac number, because 51858557 - 2² = 51858553 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51858553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25929278 + 25929279.

It is an arithmetic number, because the mean of its divisors is an integer number (25929279).

Almost surely, 2^51858557 is an apocalyptic number.

It is an amenable number.

51858557 is a deficient number, since it is larger than the sum of its proper divisors (1).

51858557 is an equidigital number, since it uses as much as digits as its factorization.

51858557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 280000, while the sum is 44.

The square root of 51858557 is about 7201.2885652500. The cubic root of 51858557 is about 372.9123868524.

The spelling of 51858557 in words is "fifty-one million, eight hundred fifty-eight thousand, five hundred fifty-seven".