280521401 has 2 divisors, whose sum is σ = 280521402. Its totient is φ = 280521400.

The previous prime is 280521347. The next prime is 280521413. The reversal of 280521401 is 104125082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 269124025 + 11397376 = 16405^2 + 3376^2 .

It is a cyclic number.

It is not a de Polignac number, because 280521401 - 2¹⁰ = 280520377 is a prime.

It is not a weakly prime, because it can be changed into another prime (280521431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140260700 + 140260701.

It is an arithmetic number, because the mean of its divisors is an integer number (140260701).

Almost surely, 2^280521401 is an apocalyptic number.

It is an amenable number.

280521401 is a deficient number, since it is larger than the sum of its proper divisors (1).

280521401 is an equidigital number, since it uses as much as digits as its factorization.

280521401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 280521401 is about 16748.7731192467. The cubic root of 280521401 is about 654.6190905343.

Adding to 280521401 its reverse (104125082), we get a palindrome (384646483).

The spelling of 280521401 in words is "two hundred eighty million, five hundred twenty-one thousand, four hundred one".