120154781 has 2 divisors, whose sum is σ = 120154782. Its totient is φ = 120154780.

The previous prime is 120154721. The next prime is 120154817. The reversal of 120154781 is 187451021.

Together with next prime (120154817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61387225 + 58767556 = 7835^2 + 7666^2 .

It is a cyclic number.

It is not a de Polignac number, because 120154781 - 2²⁶ = 53045917 is a prime.

It is a super-2 number, since 2×120154781² = 28874342794315922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120154721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60077390 + 60077391.

It is an arithmetic number, because the mean of its divisors is an integer number (60077391).

Almost surely, 2^120154781 is an apocalyptic number.

It is an amenable number.

120154781 is a deficient number, since it is larger than the sum of its proper divisors (1).

120154781 is an equidigital number, since it uses as much as digits as its factorization.

120154781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 120154781 is about 10961.5136272323. The cubic root of 120154781 is about 493.4543919594.

The spelling of 120154781 in words is "one hundred twenty million, one hundred fifty-four thousand, seven hundred eighty-one".