281996947 has 2 divisors, whose sum is σ = 281996948. Its totient is φ = 281996946.

The previous prime is 281996887. The next prime is 281996959. The reversal of 281996947 is 749699182.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-281996947 is a prime.

It is not a weakly prime, because it can be changed into another prime (281996047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140998473 + 140998474.

It is an arithmetic number, because the mean of its divisors is an integer number (140998474).

Almost surely, 2^281996947 is an apocalyptic number.

281996947 is a deficient number, since it is larger than the sum of its proper divisors (1).

281996947 is an equidigital number, since it uses as much as digits as its factorization.

281996947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 55.

The square root of 281996947 is about 16792.7647217485. The cubic root of 281996947 is about 655.7648521104.

The spelling of 281996947 in words is "two hundred eighty-one million, nine hundred ninety-six thousand, nine hundred forty-seven".