280221401 has 2 divisors, whose sum is σ = 280221402. Its totient is φ = 280221400.

The previous prime is 280221371. The next prime is 280221407. The reversal of 280221401 is 104122082.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229825600 + 50395801 = 15160^2 + 7099^2 .

It is a cyclic number.

It is not a de Polignac number, because 280221401 - 2²² = 276027097 is a prime.

It is not a weakly prime, because it can be changed into another prime (280221407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140110700 + 140110701.

It is an arithmetic number, because the mean of its divisors is an integer number (140110701).

Almost surely, 2^280221401 is an apocalyptic number.

It is an amenable number.

280221401 is a deficient number, since it is larger than the sum of its proper divisors (1).

280221401 is an equidigital number, since it uses as much as digits as its factorization.

280221401 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 280221401 is about 16739.8148436594. The cubic root of 280221401 is about 654.3856493120.

Adding to 280221401 its reverse (104122082), we get a palindrome (384343483).

The spelling of 280221401 in words is "two hundred eighty million, two hundred twenty-one thousand, four hundred one".