261370673 has 2 divisors, whose sum is σ = 261370674. Its totient is φ = 261370672.

The previous prime is 261370657. The next prime is 261370679. The reversal of 261370673 is 376073162.

It is a happy number.

261370673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147671104 + 113699569 = 12152^2 + 10663^2 .

It is a cyclic number.

It is not a de Polignac number, because 261370673 - 2⁴ = 261370657 is a prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (261370679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130685336 + 130685337.

It is an arithmetic number, because the mean of its divisors is an integer number (130685337).

Almost surely, 2^261370673 is an apocalyptic number.

It is an amenable number.

261370673 is a deficient number, since it is larger than the sum of its proper divisors (1).

261370673 is an equidigital number, since it uses as much as digits as its factorization.

261370673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 35.

The square root of 261370673 is about 16166.9623924842. The cubic root of 261370673 is about 639.3700450121.

The spelling of 261370673 in words is "two hundred sixty-one million, three hundred seventy thousand, six hundred seventy-three".