280142869 has 2 divisors, whose sum is σ = 280142870. Its totient is φ = 280142868.

The previous prime is 280142861. The next prime is 280142899. The reversal of 280142869 is 968241082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 270767025 + 9375844 = 16455^2 + 3062^2 .

It is a cyclic number.

It is not a de Polignac number, because 280142869 - 2³ = 280142861 is a prime.

It is a super-2 number, since 2×280142869² = 156960054103102322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280142861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140071434 + 140071435.

It is an arithmetic number, because the mean of its divisors is an integer number (140071435).

Almost surely, 2^280142869 is an apocalyptic number.

It is an amenable number.

280142869 is a deficient number, since it is larger than the sum of its proper divisors (1).

280142869 is an equidigital number, since it uses as much as digits as its factorization.

280142869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 280142869 is about 16737.4690141610. The cubic root of 280142869 is about 654.3245131115.

The spelling of 280142869 in words is "two hundred eighty million, one hundred forty-two thousand, eight hundred sixty-nine".