280473491 has 2 divisors, whose sum is σ = 280473492. Its totient is φ = 280473490.

The previous prime is 280473481. The next prime is 280473503. The reversal of 280473491 is 194374082.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280473491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (280473481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140236745 + 140236746.

It is an arithmetic number, because the mean of its divisors is an integer number (140236746).

Almost surely, 2^280473491 is an apocalyptic number.

280473491 is a deficient number, since it is larger than the sum of its proper divisors (1).

280473491 is an equidigital number, since it uses as much as digits as its factorization.

280473491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 280473491 is about 16747.3428041585. The cubic root of 280473491 is about 654.5818211422.

The spelling of 280473491 in words is "two hundred eighty million, four hundred seventy-three thousand, four hundred ninety-one".