261416297 has 2 divisors, whose sum is σ = 261416298. Its totient is φ = 261416296.

The previous prime is 261416291. The next prime is 261416317. The reversal of 261416297 is 792614162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192127321 + 69288976 = 13861^2 + 8324^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261416297 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 261416297.

It is not a weakly prime, because it can be changed into another prime (261416291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130708148 + 130708149.

It is an arithmetic number, because the mean of its divisors is an integer number (130708149).

Almost surely, 2^261416297 is an apocalyptic number.

It is an amenable number.

261416297 is a deficient number, since it is larger than the sum of its proper divisors (1).

261416297 is an equidigital number, since it uses as much as digits as its factorization.

261416297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 261416297 is about 16168.3733566491. The cubic root of 261416297 is about 639.4072449543.

The spelling of 261416297 in words is "two hundred sixty-one million, four hundred sixteen thousand, two hundred ninety-seven".