261119657 has 2 divisors, whose sum is σ = 261119658. Its totient is φ = 261119656.

The previous prime is 261119653. The next prime is 261119699. The reversal of 261119657 is 756911162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243235216 + 17884441 = 15596^2 + 4229^2 .

It is a cyclic number.

It is not a de Polignac number, because 261119657 - 2² = 261119653 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261119657.

It is not a weakly prime, because it can be changed into another prime (261119653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130559828 + 130559829.

It is an arithmetic number, because the mean of its divisors is an integer number (130559829).

Almost surely, 2^261119657 is an apocalyptic number.

It is an amenable number.

261119657 is a deficient number, since it is larger than the sum of its proper divisors (1).

261119657 is an equidigital number, since it uses as much as digits as its factorization.

261119657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 38.

The square root of 261119657 is about 16159.1972882319. The cubic root of 261119657 is about 639.1652993728.

The spelling of 261119657 in words is "two hundred sixty-one million, one hundred nineteen thousand, six hundred fifty-seven".