280140631 has 2 divisors, whose sum is σ = 280140632. Its totient is φ = 280140630.

The previous prime is 280140613. The next prime is 280140643. The reversal of 280140631 is 136041082.

Together with previous prime (280140613) 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 280140631 - 2⁵ = 280140599 is a prime.

It is a super-2 number, since 2×280140631² = 156957546274156322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 280140596 and 280140605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280140661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140070315 + 140070316.

It is an arithmetic number, because the mean of its divisors is an integer number (140070316).

Almost surely, 2^280140631 is an apocalyptic number.

280140631 is a deficient number, since it is larger than the sum of its proper divisors (1).

280140631 is an equidigital number, since it uses as much as digits as its factorization.

280140631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 280140631 is about 16737.4021580411. The cubic root of 280140631 is about 654.3227706885.

The spelling of 280140631 in words is "two hundred eighty million, one hundred forty thousand, six hundred thirty-one".