1673573261 has 2 divisors, whose sum is σ = 1673573262. Its totient is φ = 1673573260.

The previous prime is 1673573249. The next prime is 1673573263. The reversal of 1673573261 is 1623753761.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 855270025 + 818303236 = 29245^2 + 28606^2 .

It is a cyclic number.

It is not a de Polignac number, because 1673573261 - 2¹⁰ = 1673572237 is a prime.

Together with 1673573263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1673573263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836786630 + 836786631.

It is an arithmetic number, because the mean of its divisors is an integer number (836786631).

Almost surely, 2^1673573261 is an apocalyptic number.

It is an amenable number.

1673573261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1673573261 is an equidigital number, since it uses as much as digits as its factorization.

1673573261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 41.

The square root of 1673573261 is about 40909.3297549593. The cubic root of 1673573261 is about 1187.2665790661.

The spelling of 1673573261 in words is "one billion, six hundred seventy-three million, five hundred seventy-three thousand, two hundred sixty-one".