261335522 has 54 divisors (see below), whose sum is σ = 483500619. Its totient is φ = 105622440.

The previous prime is 261335513. The next prime is 261335531. The reversal of 261335522 is 225533162.

It is an interprime number because it is at equal distance from previous prime (261335513) and next prime (261335531).

It can be written as a sum of positive squares in only one way, i.e., 130667761 + 130667761 = 11431^2 + 11431^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=11431.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3680747 + ... + 3680817.

Almost surely, 2^261335522 is an apocalyptic number.

261335522 is a deficient number, since it is larger than the sum of its proper divisors (222165097).

261335522 is an equidigital number, since it uses as much as digits as its factorization.

261335522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204 (or 103 counting only the distinct ones).

The product of its digits is 10800, while the sum is 29.

The square root of 261335522 is about 16165.8752314868. The cubic root of 261335522 is about 639.3413813729.

Adding to 261335522 its reverse (225533162), we get a palindrome (486868684).

The spelling of 261335522 in words is "two hundred sixty-one million, three hundred thirty-five thousand, five hundred twenty-two".