261213022 has 16 divisors (see below), whose sum is σ = 456933600. Its totient is φ = 111948144.

The previous prime is 261213013. The next prime is 261213023. The reversal of 261213022 is 220312162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261213023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189703 + ... + 191074.

It is an arithmetic number, because the mean of its divisors is an integer number (28558350).

Almost surely, 2^261213022 is an apocalyptic number.

261213022 is a deficient number, since it is larger than the sum of its proper divisors (195720578).

261213022 is an equidigital number, since it uses as much as digits as its factorization.

261213022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380800 (or 380786 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 261213022 is about 16162.0859421054. The cubic root of 261213022 is about 639.2414695059.

Adding to 261213022 its reverse (220312162), we get a palindrome (481525184).

The spelling of 261213022 in words is "two hundred sixty-one million, two hundred thirteen thousand, twenty-two".