261930413 has 2 divisors, whose sum is σ = 261930414. Its totient is φ = 261930412.

The previous prime is 261930359. The next prime is 261930419. The reversal of 261930413 is 314039162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243765769 + 18164644 = 15613^2 + 4262^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261930413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261930419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130965206 + 130965207.

It is an arithmetic number, because the mean of its divisors is an integer number (130965207).

Almost surely, 2^261930413 is an apocalyptic number.

It is an amenable number.

261930413 is a deficient number, since it is larger than the sum of its proper divisors (1).

261930413 is an equidigital number, since it uses as much as digits as its factorization.

261930413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 261930413 is about 16184.2643638814. The cubic root of 261930413 is about 639.8261352260.

Adding to 261930413 its reverse (314039162), we get a palindrome (575969575).

The spelling of 261930413 in words is "two hundred sixty-one million, nine hundred thirty thousand, four hundred thirteen".