1673653391 has 2 divisors, whose sum is σ = 1673653392. Its totient is φ = 1673653390.

The previous prime is 1673653369. The next prime is 1673653463. The reversal of 1673653391 is 1933563761.

It is a weak prime.

It is an emirp because it is prime and its reverse (1933563761) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1673653391 is a prime.

It is a super-2 number, since 2×1673653391² = 5602231346411597762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1673653591) 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, 836826695 + 836826696.

It is an arithmetic number, because the mean of its divisors is an integer number (836826696).

Almost surely, 2^1673653391 is an apocalyptic number.

1673653391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1673653391 is an equidigital number, since it uses as much as digits as its factorization.

1673653391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 306180, while the sum is 44.

The square root of 1673653391 is about 40910.3091041855. The cubic root of 1673653391 is about 1187.2855273757.

The spelling of 1673653391 in words is "one billion, six hundred seventy-three million, six hundred fifty-three thousand, three hundred ninety-one".