52213981 has 2 divisors, whose sum is σ = 52213982. Its totient is φ = 52213980.

The previous prime is 52213969. The next prime is 52213991. The reversal of 52213981 is 18931225.

52213981 = 5109² + 5110².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26112100 + 26101881 = 5110^2 + 5109^2 .

It is a cyclic number.

It is not a de Polignac number, because 52213981 - 2⁷ = 52213853 is a prime.

It is a super-2 number, since 2×52213981² = 5452599623736722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52213901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26106990 + 26106991.

It is an arithmetic number, because the mean of its divisors is an integer number (26106991).

Almost surely, 2^52213981 is an apocalyptic number.

52213981 is the 5110-th centered square number.

It is an amenable number.

52213981 is a deficient number, since it is larger than the sum of its proper divisors (1).

52213981 is an equidigital number, since it uses as much as digits as its factorization.

52213981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The square root of 52213981 is about 7225.9242315430. The cubic root of 52213981 is about 373.7623935220.

The spelling of 52213981 in words is "fifty-two million, two hundred thirteen thousand, nine hundred eighty-one".