261633413 has 2 divisors, whose sum is σ = 261633414. Its totient is φ = 261633412.

The previous prime is 261633409. The next prime is 261633433. The reversal of 261633413 is 314336162.

261633413 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205578244 + 56055169 = 14338^2 + 7487^2 .

It is a cyclic number.

It is not a de Polignac number, because 261633413 - 2² = 261633409 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261633433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130816706 + 130816707.

It is an arithmetic number, because the mean of its divisors is an integer number (130816707).

Almost surely, 2^261633413 is an apocalyptic number.

It is an amenable number.

261633413 is a deficient number, since it is larger than the sum of its proper divisors (1).

261633413 is an equidigital number, since it uses as much as digits as its factorization.

261633413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 29.

The square root of 261633413 is about 16175.0861821506. The cubic root of 261633413 is about 639.5842131712.

Adding to 261633413 its reverse (314336162), we get a palindrome (575969575).

The spelling of 261633413 in words is "two hundred sixty-one million, six hundred thirty-three thousand, four hundred thirteen".