261451140 has 24 divisors (see below), whose sum is σ = 732063360. Its totient is φ = 69720288.

The previous prime is 261451129. The next prime is 261451163. The reversal of 261451140 is 41154162.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 261451140.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2178700 + ... + 2178819.

It is an arithmetic number, because the mean of its divisors is an integer number (30502640).

Almost surely, 2^261451140 is an apocalyptic number.

261451140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261451140 is an abundant number, since it is smaller than the sum of its proper divisors (470612220).

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

261451140 is a wasteful number, since it uses less digits than its factorization.

261451140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4357531 (or 4357529 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 261451140 is about 16169.4508255537. The cubic root of 261451140 is about 639.4356515956.

The spelling of 261451140 in words is "two hundred sixty-one million, four hundred fifty-one thousand, one hundred forty".