261350497 has 2 divisors, whose sum is σ = 261350498. Its totient is φ = 261350496.

The previous prime is 261350477. The next prime is 261350501. The reversal of 261350497 is 794053162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187115041 + 74235456 = 13679^2 + 8616^2 .

It is a cyclic number.

It is not a de Polignac number, because 261350497 - 2¹¹ = 261348449 is a prime.

It is not a weakly prime, because it can be changed into another prime (261350437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130675248 + 130675249.

It is an arithmetic number, because the mean of its divisors is an integer number (130675249).

Almost surely, 2^261350497 is an apocalyptic number.

It is an amenable number.

261350497 is a deficient number, since it is larger than the sum of its proper divisors (1).

261350497 is an equidigital number, since it uses as much as digits as its factorization.

261350497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 261350497 is about 16166.3383918561. The cubic root of 261350497 is about 639.3535929470.

The spelling of 261350497 in words is "two hundred sixty-one million, three hundred fifty thousand, four hundred ninety-seven".