261255122 has 8 divisors (see below), whose sum is σ = 392041596. Its totient is φ = 130574592.

The previous prime is 261255119. The next prime is 261255151. The reversal of 261255122 is 221552162.

It can be written as a sum of positive squares in 2 ways, for example, as 253796761 + 7458361 = 15931^2 + 2731^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 261255091 and 261255100.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 20003 + ... + 30374.

Almost surely, 2^261255122 is an apocalyptic number.

261255122 is a deficient number, since it is larger than the sum of its proper divisors (130786474).

261255122 is a wasteful number, since it uses less digits than its factorization.

261255122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52972.

The product of its digits is 2400, while the sum is 26.

The square root of 261255122 is about 16163.3883205224. The cubic root of 261255122 is about 639.2758100861.

The spelling of 261255122 in words is "two hundred sixty-one million, two hundred fifty-five thousand, one hundred twenty-two".