261226146 has 8 divisors (see below), whose sum is σ = 522452304. Its totient is φ = 87075380.

The previous prime is 261226139. The next prime is 261226159. The reversal of 261226146 is 641622162.

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

261226146 is an admirable number.

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, 21768840 + ... + 21768851.

It is an arithmetic number, because the mean of its divisors is an integer number (65306538).

Almost surely, 2^261226146 is an apocalyptic number.

261226146 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.

261226146 is a wasteful number, since it uses less digits than its factorization.

261226146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43537696.

The product of its digits is 6912, while the sum is 30.

The square root of 261226146 is about 16162.4919489539. The cubic root of 261226146 is about 639.2521750270.

The spelling of 261226146 in words is "two hundred sixty-one million, two hundred twenty-six thousand, one hundred forty-six".