261673 has 2 divisors, whose sum is σ = 261674. Its totient is φ = 261672.

The previous prime is 261643. The next prime is 261697. The reversal of 261673 is 376162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 257049 + 4624 = 507^2 + 68^2 .

It is a cyclic number.

It is not a de Polignac number, because 261673 - 2⁵ = 261641 is a prime.

It is equal to p₂₂₉₆₆ and since 261673 and 22966 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (261643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130836 + 130837.

It is an arithmetic number, because the mean of its divisors is an integer number (130837).

2²⁶¹⁶⁷³ is an apocalyptic number.

It is an amenable number.

261673 is a deficient number, since it is larger than the sum of its proper divisors (1).

261673 is an equidigital number, since it uses as much as digits as its factorization.

261673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 25.

The square root of 261673 is about 511.5398322712. The cubic root of 261673 is about 63.9616469428.

The spelling of 261673 in words is "two hundred sixty-one thousand, six hundred seventy-three".