261173273 has 2 divisors, whose sum is σ = 261173274. Its totient is φ = 261173272.

The previous prime is 261173243. The next prime is 261173293. The reversal of 261173273 is 372371162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 240498064 + 20675209 = 15508^2 + 4547^2 .

It is a cyclic number.

It is not a de Polignac number, because 261173273 - 2²⁴ = 244396057 is a prime.

It is a super-2 number, since 2×261173273² = 136422957059065058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261173203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130586636 + 130586637.

It is an arithmetic number, because the mean of its divisors is an integer number (130586637).

Almost surely, 2^261173273 is an apocalyptic number.

It is an amenable number.

261173273 is a deficient number, since it is larger than the sum of its proper divisors (1).

261173273 is an equidigital number, since it uses as much as digits as its factorization.

261173273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 32.

The square root of 261173273 is about 16160.8561963777. The cubic root of 261173273 is about 639.2090432280.

The spelling of 261173273 in words is "two hundred sixty-one million, one hundred seventy-three thousand, two hundred seventy-three".