1673687381 has 2 divisors, whose sum is σ = 1673687382. Its totient is φ = 1673687380.

The previous prime is 1673687369. The next prime is 1673687399. The reversal of 1673687381 is 1837863761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1058200900 + 615486481 = 32530^2 + 24809^2 .

It is a cyclic number.

It is not a de Polignac number, because 1673687381 - 2³⁰ = 599945557 is a prime.

It is a super-2 number, since 2×1673687381² = 5602458898637278322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1673687321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836843690 + 836843691.

It is an arithmetic number, because the mean of its divisors is an integer number (836843691).

Almost surely, 2^1673687381 is an apocalyptic number.

It is an amenable number.

1673687381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1673687381 is an equidigital number, since it uses as much as digits as its factorization.

1673687381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 50.

The square root of 1673687381 is about 40910.7245230392. The cubic root of 1673687381 is about 1187.2935647949.

The spelling of 1673687381 in words is "one billion, six hundred seventy-three million, six hundred eighty-seven thousand, three hundred eighty-one".