280055731 has 2 divisors, whose sum is σ = 280055732. Its totient is φ = 280055730.

The previous prime is 280055693. The next prime is 280055753. The reversal of 280055731 is 137550082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280055731 - 2²⁷ = 145838003 is a prime.

It is a super-2 number, since 2×280055731² = 156862424931888722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 280055693 and 280055702.

It is not a weakly prime, because it can be changed into another prime (280055761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140027865 + 140027866.

It is an arithmetic number, because the mean of its divisors is an integer number (140027866).

Almost surely, 2^280055731 is an apocalyptic number.

280055731 is a deficient number, since it is larger than the sum of its proper divisors (1).

280055731 is an equidigital number, since it uses as much as digits as its factorization.

280055731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 280055731 is about 16734.8657299663. The cubic root of 280055731 is about 654.2566638717.

The spelling of 280055731 in words is "two hundred eighty million, fifty-five thousand, seven hundred thirty-one".