281421013 has 2 divisors, whose sum is σ = 281421014. Its totient is φ = 281421012.

The previous prime is 281421011. The next prime is 281421037. The reversal of 281421013 is 310124182.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169442289 + 111978724 = 13017^2 + 10582^2 .

It is a cyclic number.

It is not a de Polignac number, because 281421013 - 2¹ = 281421011 is a prime.

Together with 281421011, 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 (281421011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140710506 + 140710507.

It is an arithmetic number, because the mean of its divisors is an integer number (140710507).

Almost surely, 2^281421013 is an apocalyptic number.

It is an amenable number.

281421013 is a deficient number, since it is larger than the sum of its proper divisors (1).

281421013 is an equidigital number, since it uses as much as digits as its factorization.

281421013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 281421013 is about 16775.6076790082. The cubic root of 281421013 is about 655.3181159716.

Adding to 281421013 its reverse (310124182), we get a palindrome (591545195).

The spelling of 281421013 in words is "two hundred eighty-one million, four hundred twenty-one thousand, thirteen".