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52257721 is a prime number
BaseRepresentation
bin1100011101011…
…0001110111001
310122022222010011
43013112032321
5101334221341
65104021521
71203116605
oct307261671
9118288104
1052257721
1127552aaa
12156018a1
13aa98c39
146d24505
1548c3b81
hex31d63b9

52257721 has 2 divisors, whose sum is σ = 52257722. Its totient is φ = 52257720.

The previous prime is 52257719. The next prime is 52257731. The reversal of 52257721 is 12775225.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33767721 + 18490000 = 5811^2 + 4300^2 .

It is a cyclic number.

It is not a de Polignac number, because 52257721 - 21 = 52257719 is a prime.

It is a super-2 number, since 2×522577212 = 5461738808227682, which contains 22 as substring.

Together with 52257719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (52257731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26128860 + 26128861.

It is an arithmetic number, because the mean of its divisors is an integer number (26128861).

Almost surely, 252257721 is an apocalyptic number.

It is an amenable number.

52257721 is a deficient number, since it is larger than the sum of its proper divisors (1).

52257721 is an equidigital number, since it uses as much as digits as its factorization.

52257721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9800, while the sum is 31.

The square root of 52257721 is about 7228.9502004095. The cubic root of 52257721 is about 373.8667321420.

The spelling of 52257721 in words is "fifty-two million, two hundred fifty-seven thousand, seven hundred twenty-one".