261655122 has 8 divisors (see below), whose sum is σ = 523310256. Its totient is φ = 87218372.

The previous prime is 261655103. The next prime is 261655127. The reversal of 261655122 is 221556162.

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

261655122 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 261655122.

It is not an unprimeable number, because it can be changed into a prime (261655127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21804588 + ... + 21804599.

It is an arithmetic number, because the mean of its divisors is an integer number (65413782).

Almost surely, 2^261655122 is an apocalyptic number.

261655122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261655122 is a wasteful number, since it uses less digits than its factorization.

261655122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43609192.

The product of its digits is 7200, while the sum is 30.

The square root of 261655122 is about 16175.7572311160. The cubic root of 261655122 is about 639.6019024889.

The spelling of 261655122 in words is "two hundred sixty-one million, six hundred fifty-five thousand, one hundred twenty-two".