261630113 has 2 divisors, whose sum is σ = 261630114. Its totient is φ = 261630112.

The previous prime is 261630107. The next prime is 261630137. The reversal of 261630113 is 311036162.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142754704 + 118875409 = 11948^2 + 10903^2 .

It is a cyclic number.

It is not a de Polignac number, because 261630113 - 2²⁴ = 244852897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261639113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130815056 + 130815057.

It is an arithmetic number, because the mean of its divisors is an integer number (130815057).

Almost surely, 2^261630113 is an apocalyptic number.

It is an amenable number.

261630113 is a deficient number, since it is larger than the sum of its proper divisors (1).

261630113 is an equidigital number, since it uses as much as digits as its factorization.

261630113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 261630113 is about 16174.9841730989. The cubic root of 261630113 is about 639.5815241202.

Adding to 261630113 its reverse (311036162), we get a palindrome (572666275).

The spelling of 261630113 in words is "two hundred sixty-one million, six hundred thirty thousand, one hundred thirteen".