261998846 has 4 divisors (see below), whose sum is σ = 392998272. Its totient is φ = 130999422.

The previous prime is 261998827. The next prime is 261998857. The reversal of 261998846 is 648899162.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 65499710 + ... + 65499713.

It is an arithmetic number, because the mean of its divisors is an integer number (98249568).

Almost surely, 2^261998846 is an apocalyptic number.

261998846 is a deficient number, since it is larger than the sum of its proper divisors (130999426).

261998846 is a wasteful number, since it uses less digits than its factorization.

261998846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130999425.

The product of its digits is 1492992, while the sum is 53.

The square root of 261998846 is about 16186.3784090203. The cubic root of 261998846 is about 639.8818515627.

The spelling of 261998846 in words is "two hundred sixty-one million, nine hundred ninety-eight thousand, eight hundred forty-six".