52213781 has 2 divisors, whose sum is σ = 52213782. Its totient is φ = 52213780.

The previous prime is 52213747. The next prime is 52213793. The reversal of 52213781 is 18731225.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46648900 + 5564881 = 6830^2 + 2359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52213781 is a prime.

It is a super-2 number, since 2×52213781² = 5452557852631922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52213741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26106890 + 26106891.

It is an arithmetic number, because the mean of its divisors is an integer number (26106891).

Almost surely, 2^52213781 is an apocalyptic number.

It is an amenable number.

52213781 is a deficient number, since it is larger than the sum of its proper divisors (1).

52213781 is an equidigital number, since it uses as much as digits as its factorization.

52213781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 29.

The square root of 52213781 is about 7225.9103924696. The cubic root of 52213781 is about 373.7619163026.

The spelling of 52213781 in words is "fifty-two million, two hundred thirteen thousand, seven hundred eighty-one".