261122894 has 4 divisors (see below), whose sum is σ = 391684344. Its totient is φ = 130561446.

The previous prime is 261122881. The next prime is 261122923. The reversal of 261122894 is 498221162.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65280722 + ... + 65280725.

It is an arithmetic number, because the mean of its divisors is an integer number (97921086).

Almost surely, 2^261122894 is an apocalyptic number.

261122894 is a deficient number, since it is larger than the sum of its proper divisors (130561450).

261122894 is a wasteful number, since it uses less digits than its factorization.

261122894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130561449.

The product of its digits is 13824, while the sum is 35.

The square root of 261122894 is about 16159.2974475996. The cubic root of 261122894 is about 639.1679405240.

The spelling of 261122894 in words is "two hundred sixty-one million, one hundred twenty-two thousand, eight hundred ninety-four".