51022261 has 2 divisors, whose sum is σ = 51022262. Its totient is φ = 51022260.

The previous prime is 51022259. The next prime is 51022289. The reversal of 51022261 is 16222015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48790225 + 2232036 = 6985^2 + 1494^2 .

It is a cyclic number.

It is not a de Polignac number, because 51022261 - 2¹ = 51022259 is a prime.

It is a super-2 number, since 2×51022261² = 5206542235104242, which contains 22 as substring.

Together with 51022259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51022241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25511130 + 25511131.

It is an arithmetic number, because the mean of its divisors is an integer number (25511131).

Almost surely, 2^51022261 is an apocalyptic number.

It is an amenable number.

51022261 is a deficient number, since it is larger than the sum of its proper divisors (1).

51022261 is an equidigital number, since it uses as much as digits as its factorization.

51022261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 51022261 is about 7142.9868402511. The cubic root of 51022261 is about 370.8969255193.

Adding to 51022261 its reverse (16222015), we get a palindrome (67244276).

The spelling of 51022261 in words is "fifty-one million, twenty-two thousand, two hundred sixty-one".