253213981 has 2 divisors, whose sum is σ = 253213982. Its totient is φ = 253213980.

The previous prime is 253213979. The next prime is 253214009. The reversal of 253213981 is 189312352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221741881 + 31472100 = 14891^2 + 5610^2 .

It is a cyclic number.

It is not a de Polignac number, because 253213981 - 2¹ = 253213979 is a prime.

It is a super-2 number, since 2×253213981² = 128234640347736722, which contains 22 as substring.

Together with 253213979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253213901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126606990 + 126606991.

It is an arithmetic number, because the mean of its divisors is an integer number (126606991).

Almost surely, 2^253213981 is an apocalyptic number.

It is an amenable number.

253213981 is a deficient number, since it is larger than the sum of its proper divisors (1).

253213981 is an equidigital number, since it uses as much as digits as its factorization.

253213981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 34.

The square root of 253213981 is about 15912.6987340300. The cubic root of 253213981 is about 632.6486132377.

The spelling of 253213981 in words is "two hundred fifty-three million, two hundred thirteen thousand, nine hundred eighty-one".