122180391 has 6 divisors (see below), whose sum is σ = 176482800. Its totient is φ = 81453588.

The previous prime is 122180371. The next prime is 122180417. The reversal of 122180391 is 193081221.

It is not a de Polignac number, because 122180391 - 2¹⁹ = 121656103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122180341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6787791 + ... + 6787808.

It is an arithmetic number, because the mean of its divisors is an integer number (29413800).

Almost surely, 2^122180391 is an apocalyptic number.

122180391 is a deficient number, since it is larger than the sum of its proper divisors (54302409).

122180391 is a wasteful number, since it uses less digits than its factorization.

122180391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13575605 (or 13575602 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 122180391 is about 11053.5239177377. The cubic root of 122180391 is about 496.2118943219.

The spelling of 122180391 in words is "one hundred twenty-two million, one hundred eighty thousand, three hundred ninety-one".