261612413 has 2 divisors, whose sum is σ = 261612414. Its totient is φ = 261612412.

The previous prime is 261612401. The next prime is 261612427. The reversal of 261612413 is 314216162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227014489 + 34597924 = 15067^2 + 5882^2 .

It is a cyclic number.

It is not a de Polignac number, because 261612413 - 2¹⁸ = 261350269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261612443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130806206 + 130806207.

It is an arithmetic number, because the mean of its divisors is an integer number (130806207).

Almost surely, 2^261612413 is an apocalyptic number.

It is an amenable number.

261612413 is a deficient number, since it is larger than the sum of its proper divisors (1).

261612413 is an equidigital number, since it uses as much as digits as its factorization.

261612413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 261612413 is about 16174.4370226602. The cubic root of 261612413 is about 639.5671006426.

Adding to 261612413 its reverse (314216162), we get a palindrome (575828575).

The spelling of 261612413 in words is "two hundred sixty-one million, six hundred twelve thousand, four hundred thirteen".