281400401 has 2 divisors, whose sum is σ = 281400402. Its totient is φ = 281400400.

The previous prime is 281400307. The next prime is 281400403. The reversal of 281400401 is 104004182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176358400 + 105042001 = 13280^2 + 10249^2 .

It is a cyclic number.

It is not a de Polignac number, because 281400401 - 2²⁶ = 214291537 is a prime.

It is a Sophie Germain prime.

Together with 281400403, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (281400403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140700200 + 140700201.

It is an arithmetic number, because the mean of its divisors is an integer number (140700201).

Almost surely, 2^281400401 is an apocalyptic number.

It is an amenable number.

281400401 is a deficient number, since it is larger than the sum of its proper divisors (1).

281400401 is an equidigital number, since it uses as much as digits as its factorization.

281400401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 281400401 is about 16774.9933233966. The cubic root of 281400401 is about 655.3021165187.

Adding to 281400401 its reverse (104004182), we get a palindrome (385404583).

The spelling of 281400401 in words is "two hundred eighty-one million, four hundred thousand, four hundred one".