261323806 has 8 divisors (see below), whose sum is σ = 392103504. Its totient is φ = 130622640.

The previous prime is 261323767. The next prime is 261323809. The reversal of 261323806 is 608323162.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261323809) by changing a digit.

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, 10455 + ... + 25138.

It is an arithmetic number, because the mean of its divisors is an integer number (49012938).

Almost surely, 2^261323806 is an apocalyptic number.

261323806 is a deficient number, since it is larger than the sum of its proper divisors (130779698).

261323806 is a wasteful number, since it uses less digits than its factorization.

261323806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39266.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 261323806 is about 16165.5128591703. The cubic root of 261323806 is about 639.3318270708.

Adding to 261323806 its reverse (608323162), we get a palindrome (869646968).

The spelling of 261323806 in words is "two hundred sixty-one million, three hundred twenty-three thousand, eight hundred six".