261471634 has 8 divisors (see below), whose sum is σ = 392652288. Its totient is φ = 130587540.

The previous prime is 261471571. The next prime is 261471641. The reversal of 261471634 is 436174162.

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

It is a self number, because there is not a number n which added to its sum of digits gives 261471634.

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, 71922 + ... + 75469.

It is an arithmetic number, because the mean of its divisors is an integer number (49081536).

Almost surely, 2^261471634 is an apocalyptic number.

261471634 is a deficient number, since it is larger than the sum of its proper divisors (131180654).

261471634 is a wasteful number, since it uses less digits than its factorization.

261471634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148280.

The product of its digits is 24192, while the sum is 34.

The square root of 261471634 is about 16170.0845390493. The cubic root of 261471634 is about 639.4523586711.

The spelling of 261471634 in words is "two hundred sixty-one million, four hundred seventy-one thousand, six hundred thirty-four".