51670261 has 2 divisors, whose sum is σ = 51670262. Its totient is φ = 51670260.

The previous prime is 51670247. The next prime is 51670271. The reversal of 51670261 is 16207615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42706225 + 8964036 = 6535^2 + 2994^2 .

It is a cyclic number.

It is not a de Polignac number, because 51670261 - 2¹¹ = 51668213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51670271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25835130 + 25835131.

It is an arithmetic number, because the mean of its divisors is an integer number (25835131).

Almost surely, 2^51670261 is an apocalyptic number.

It is an amenable number.

51670261 is a deficient number, since it is larger than the sum of its proper divisors (1).

51670261 is an equidigital number, since it uses as much as digits as its factorization.

51670261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 51670261 is about 7188.2029047600. The cubic root of 51670261 is about 372.4604969895.

Adding to 51670261 its reverse (16207615), we get a palindrome (67877876).

The spelling of 51670261 in words is "fifty-one million, six hundred seventy thousand, two hundred sixty-one".