280505501 has 2 divisors, whose sum is σ = 280505502. Its totient is φ = 280505500.

The previous prime is 280505497. The next prime is 280505549. The reversal of 280505501 is 105505082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 251064025 + 29441476 = 15845^2 + 5426^2 .

It is a cyclic number.

It is not a de Polignac number, because 280505501 - 2² = 280505497 is a prime.

It is a super-2 number, since 2×280505501² = 157366672182522002, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280505551) 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, 140252750 + 140252751.

It is an arithmetic number, because the mean of its divisors is an integer number (140252751).

Almost surely, 2^280505501 is an apocalyptic number.

It is an amenable number.

280505501 is a deficient number, since it is larger than the sum of its proper divisors (1).

280505501 is an equidigital number, since it uses as much as digits as its factorization.

280505501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 280505501 is about 16748.2984508875. The cubic root of 280505501 is about 654.6067223274.

The spelling of 280505501 in words is "two hundred eighty million, five hundred five thousand, five hundred one".