280432991 has 2 divisors, whose sum is σ = 280432992. Its totient is φ = 280432990.

The previous prime is 280432979. The next prime is 280432993. The reversal of 280432991 is 199234082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280432991 - 2⁶ = 280432927 is a prime.

It is a Sophie Germain prime.

Together with 280432993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280432993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140216495 + 140216496.

It is an arithmetic number, because the mean of its divisors is an integer number (140216496).

Almost surely, 2^280432991 is an apocalyptic number.

280432991 is a deficient number, since it is larger than the sum of its proper divisors (1).

280432991 is an equidigital number, since it uses as much as digits as its factorization.

280432991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 280432991 is about 16746.1336134643. The cubic root of 280432991 is about 654.5503127100.

The spelling of 280432991 in words is "two hundred eighty million, four hundred thirty-two thousand, nine hundred ninety-one".