51566993 has 2 divisors, whose sum is σ = 51566994. Its totient is φ = 51566992.

The previous prime is 51566951. The next prime is 51567029. The reversal of 51566993 is 39966515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39337984 + 12229009 = 6272^2 + 3497^2 .

It is a cyclic number.

It is not a de Polignac number, because 51566993 - 2¹⁸ = 51304849 is a prime.

It is not a weakly prime, because it can be changed into another prime (51566903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25783496 + 25783497.

It is an arithmetic number, because the mean of its divisors is an integer number (25783497).

Almost surely, 2^51566993 is an apocalyptic number.

It is an amenable number.

51566993 is a deficient number, since it is larger than the sum of its proper divisors (1).

51566993 is an equidigital number, since it uses as much as digits as its factorization.

51566993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 218700, while the sum is 44.

The square root of 51566993 is about 7181.0161537209. The cubic root of 51566993 is about 372.2121987582.

The spelling of 51566993 in words is "fifty-one million, five hundred sixty-six thousand, nine hundred ninety-three".