120135391 has 2 divisors, whose sum is σ = 120135392. Its totient is φ = 120135390.

The previous prime is 120135383. The next prime is 120135409. The reversal of 120135391 is 193531021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 120135391 - 2³ = 120135383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120135341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60067695 + 60067696.

It is an arithmetic number, because the mean of its divisors is an integer number (60067696).

Almost surely, 2^120135391 is an apocalyptic number.

120135391 is a deficient number, since it is larger than the sum of its proper divisors (1).

120135391 is an equidigital number, since it uses as much as digits as its factorization.

120135391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 120135391 is about 10960.6291334029. The cubic root of 120135391 is about 493.4278467668.

The spelling of 120135391 in words is "one hundred twenty million, one hundred thirty-five thousand, three hundred ninety-one".