261351946 has 8 divisors (see below), whose sum is σ = 398672640. Its totient is φ = 128461068.

The previous prime is 261351929. The next prime is 261351947. The reversal of 261351946 is 649153162.

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

It is not an unprimeable number, because it can be changed into a prime (261351947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1107306 + ... + 1107541.

It is an arithmetic number, because the mean of its divisors is an integer number (49834080).

Almost surely, 2^261351946 is an apocalyptic number.

261351946 is a deficient number, since it is larger than the sum of its proper divisors (137320694).

261351946 is a wasteful number, since it uses less digits than its factorization.

261351946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214908.

The product of its digits is 38880, while the sum is 37.

The square root of 261351946 is about 16166.3832071370. The cubic root of 261351946 is about 639.3547745297.

The spelling of 261351946 in words is "two hundred sixty-one million, three hundred fifty-one thousand, nine hundred forty-six".