122805891 has 12 divisors (see below), whose sum is σ = 191031568. Its totient is φ = 75572784.

The previous prime is 122805889. The next prime is 122805899. The reversal of 122805891 is 198508221.

It is not a de Polignac number, because 122805891 - 2¹ = 122805889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (122805899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 524695 + ... + 524928.

Almost surely, 2^122805891 is an apocalyptic number.

122805891 is a deficient number, since it is larger than the sum of its proper divisors (68225677).

122805891 is a wasteful number, since it uses less digits than its factorization.

122805891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049642 (or 1049639 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 122805891 is about 11081.7819415471. The cubic root of 122805891 is about 497.0572355871.

The spelling of 122805891 in words is "one hundred twenty-two million, eight hundred five thousand, eight hundred ninety-one".