280426631 has 2 divisors, whose sum is σ = 280426632. Its totient is φ = 280426630.

The previous prime is 280426613. The next prime is 280426639. The reversal of 280426631 is 136624082.

Together with previous prime (280426613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280426631 - 2¹⁸ = 280164487 is a prime.

It is a super-2 number, since 2×280426631² = 157278190748020322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280426639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140213315 + 140213316.

It is an arithmetic number, because the mean of its divisors is an integer number (140213316).

Almost surely, 2^280426631 is an apocalyptic number.

280426631 is a deficient number, since it is larger than the sum of its proper divisors (1).

280426631 is an equidigital number, since it uses as much as digits as its factorization.

280426631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 280426631 is about 16745.9437178082. The cubic root of 280426631 is about 654.5453644436.

The spelling of 280426631 in words is "two hundred eighty million, four hundred twenty-six thousand, six hundred thirty-one".