261027397 has 2 divisors, whose sum is σ = 261027398. Its totient is φ = 261027396.

The previous prime is 261027343. The next prime is 261027439. The reversal of 261027397 is 793720162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152992161 + 108035236 = 12369^2 + 10394^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261027397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261027317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130513698 + 130513699.

It is an arithmetic number, because the mean of its divisors is an integer number (130513699).

Almost surely, 2^261027397 is an apocalyptic number.

It is an amenable number.

261027397 is a deficient number, since it is larger than the sum of its proper divisors (1).

261027397 is an equidigital number, since it uses as much as digits as its factorization.

261027397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 261027397 is about 16156.3423150167. The cubic root of 261027397 is about 639.0900128960.

The spelling of 261027397 in words is "two hundred sixty-one million, twenty-seven thousand, three hundred ninety-seven".