51722131 has 2 divisors, whose sum is σ = 51722132. Its totient is φ = 51722130.

The previous prime is 51722129. The next prime is 51722159. The reversal of 51722131 is 13122715.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51722131 - 2¹ = 51722129 is a prime.

It is a super-2 number, since 2×51722131² = 5350357670362322, which contains 22 as substring.

Together with 51722129, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51722831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25861065 + 25861066.

It is an arithmetic number, because the mean of its divisors is an integer number (25861066).

Almost surely, 2^51722131 is an apocalyptic number.

51722131 is the 4549-th centered pentagonal number.

51722131 is a deficient number, since it is larger than the sum of its proper divisors (1).

51722131 is an equidigital number, since it uses as much as digits as its factorization.

51722131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 22.

The square root of 51722131 is about 7191.8099947093. The cubic root of 51722131 is about 372.5850887403.

Adding to 51722131 its reverse (13122715), we get a palindrome (64844846).

The spelling of 51722131 in words is "fifty-one million, seven hundred twenty-two thousand, one hundred thirty-one".