52221731 has 2 divisors, whose sum is σ = 52221732. Its totient is φ = 52221730.

The previous prime is 52221713. The next prime is 52221733. The reversal of 52221731 is 13712225.

It is a happy number.

Together with previous prime (52221713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52221731 is a prime.

It is a super-2 number, since 2×52221731² = 5454218377272722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 52221733, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 52221697 and 52221706.

It is not a weakly prime, because it can be changed into another prime (52221733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26110865 + 26110866.

It is an arithmetic number, because the mean of its divisors is an integer number (26110866).

Almost surely, 2^52221731 is an apocalyptic number.

52221731 is a deficient number, since it is larger than the sum of its proper divisors (1).

52221731 is an equidigital number, since it uses as much as digits as its factorization.

52221731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 23.

The square root of 52221731 is about 7226.4604752258. The cubic root of 52221731 is about 373.7808848353.

Adding to 52221731 its reverse (13712225), we get a palindrome (65933956).

The spelling of 52221731 in words is "fifty-two million, two hundred twenty-one thousand, seven hundred thirty-one".