120166391 has 2 divisors, whose sum is σ = 120166392. Its totient is φ = 120166390.

The previous prime is 120166373. The next prime is 120166411. The reversal of 120166391 is 193661021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 120166391 - 2⁶ = 120166327 is a prime.

It is a Chen prime.

It is equal to p_6850622 and since 120166391 and 6850622 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120166301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60083195 + 60083196.

It is an arithmetic number, because the mean of its divisors is an integer number (60083196).

Almost surely, 2^120166391 is an apocalyptic number.

120166391 is a deficient number, since it is larger than the sum of its proper divisors (1).

120166391 is an equidigital number, since it uses as much as digits as its factorization.

120166391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 120166391 is about 10962.0431945874. The cubic root of 120166391 is about 493.4702848517.

The spelling of 120166391 in words is "one hundred twenty million, one hundred sixty-six thousand, three hundred ninety-one".