1284671881 has 2 divisors, whose sum is σ = 1284671882. Its totient is φ = 1284671880.

The previous prime is 1284671867. The next prime is 1284671933. The reversal of 1284671881 is 1881764821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1090320400 + 194351481 = 33020^2 + 13941^2 .

It is a cyclic number.

It is not a de Polignac number, because 1284671881 - 2¹⁵ = 1284639113 is a prime.

It is a super-2 number, since 2×1284671881² = 3300763683664156322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1284675881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642335940 + 642335941.

It is an arithmetic number, because the mean of its divisors is an integer number (642335941).

Almost surely, 2^1284671881 is an apocalyptic number.

It is an amenable number.

1284671881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1284671881 is an equidigital number, since it uses as much as digits as its factorization.

1284671881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172032, while the sum is 46.

The square root of 1284671881 is about 35842.3196933457. The cubic root of 1284671881 is about 1087.0864256599.

The spelling of 1284671881 in words is "one billion, two hundred eighty-four million, six hundred seventy-one thousand, eight hundred eighty-one".