281139413 has 2 divisors, whose sum is σ = 281139414. Its totient is φ = 281139412.

The previous prime is 281139389. The next prime is 281139457. The reversal of 281139413 is 314931182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228402769 + 52736644 = 15113^2 + 7262^2 .

It is a cyclic number.

It is not a de Polignac number, because 281139413 - 2⁶ = 281139349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 281139413.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281136413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140569706 + 140569707.

It is an arithmetic number, because the mean of its divisors is an integer number (140569707).

Almost surely, 2^281139413 is an apocalyptic number.

It is an amenable number.

281139413 is a deficient number, since it is larger than the sum of its proper divisors (1).

281139413 is an equidigital number, since it uses as much as digits as its factorization.

281139413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 281139413 is about 16767.2124397587. The cubic root of 281139413 is about 655.0994647234.

It can be divided in two parts, 2811 and 39413, that added together give a palindrome (42224).

The spelling of 281139413 in words is "two hundred eighty-one million, one hundred thirty-nine thousand, four hundred thirteen".