1673978881 has 2 divisors, whose sum is σ = 1673978882. Its totient is φ = 1673978880.

The previous prime is 1673978843. The next prime is 1673978921. The reversal of 1673978881 is 1888793761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1602000625 + 71978256 = 40025^2 + 8484^2 .

It is a cyclic number.

It is not a de Polignac number, because 1673978881 - 2²⁹ = 1137107969 is a prime.

It is a super-2 number, since 2×1673978881² = 5604410588068024322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1673978081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836989440 + 836989441.

It is an arithmetic number, because the mean of its divisors is an integer number (836989441).

Almost surely, 2^1673978881 is an apocalyptic number.

It is an amenable number.

1673978881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1673978881 is an equidigital number, since it uses as much as digits as its factorization.

1673978881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 58.

The square root of 1673978881 is about 40914.2870034417. The cubic root of 1673978881 is about 1187.3624896506.

The spelling of 1673978881 in words is "one billion, six hundred seventy-three million, nine hundred seventy-eight thousand, eight hundred eighty-one".