51170681 has 2 divisors, whose sum is σ = 51170682. Its totient is φ = 51170680.

The previous prime is 51170671. The next prime is 51170687. The reversal of 51170681 is 18607115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40386025 + 10784656 = 6355^2 + 3284^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51170681 is a prime.

It is a super-2 number, since 2×51170681² = 5236877188007522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51170687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25585340 + 25585341.

It is an arithmetic number, because the mean of its divisors is an integer number (25585341).

Almost surely, 2^51170681 is an apocalyptic number.

It is an amenable number.

51170681 is a deficient number, since it is larger than the sum of its proper divisors (1).

51170681 is an equidigital number, since it uses as much as digits as its factorization.

51170681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 29.

The square root of 51170681 is about 7153.3685072139. The cubic root of 51170681 is about 371.2562146435.

Adding to 51170681 its reverse (18607115), we get a palindrome (69777796).

The spelling of 51170681 in words is "fifty-one million, one hundred seventy thousand, six hundred eighty-one".