261244601 has 2 divisors, whose sum is σ = 261244602. Its totient is φ = 261244600.

The previous prime is 261244583. The next prime is 261244609. The reversal of 261244601 is 106442162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 257634601 + 3610000 = 16051^2 + 1900^2 .

It is a cyclic number.

It is not a de Polignac number, because 261244601 - 2⁶ = 261244537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261244609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130622300 + 130622301.

It is an arithmetic number, because the mean of its divisors is an integer number (130622301).

Almost surely, 2^261244601 is an apocalyptic number.

It is an amenable number.

261244601 is a deficient number, since it is larger than the sum of its proper divisors (1).

261244601 is an equidigital number, since it uses as much as digits as its factorization.

261244601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 261244601 is about 16163.0628594954. The cubic root of 261244601 is about 639.2672285496.

Adding to 261244601 its reverse (106442162), we get a palindrome (367686763).

The spelling of 261244601 in words is "two hundred sixty-one million, two hundred forty-four thousand, six hundred one".