261267198 has 8 divisors (see below), whose sum is σ = 522534408. Its totient is φ = 87089064.

The previous prime is 261267137. The next prime is 261267199. The reversal of 261267198 is 891762162.

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

261267198 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261267199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21772261 + ... + 21772272.

It is an arithmetic number, because the mean of its divisors is an integer number (65316801).

Almost surely, 2^261267198 is an apocalyptic number.

261267198 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.

261267198 is a wasteful number, since it uses less digits than its factorization.

261267198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43544538.

The product of its digits is 72576, while the sum is 42.

The square root of 261267198 is about 16163.7618764940. The cubic root of 261267198 is about 639.2856596866.

The spelling of 261267198 in words is "two hundred sixty-one million, two hundred sixty-seven thousand, one hundred ninety-eight".