120136553 has 4 divisors (see below), whose sum is σ = 120387840. Its totient is φ = 119885268.

The previous prime is 120136547. The next prime is 120136579. The reversal of 120136553 is 355631021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 355631021 = 16097 ⋅22093.

It is a cyclic number.

It is not a de Polignac number, because 120136553 - 2¹⁰ = 120135529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120126553) 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 3 ways as a sum of consecutive naturals, for example, 124925 + ... + 125882.

It is an arithmetic number, because the mean of its divisors is an integer number (30096960).

Almost surely, 2^120136553 is an apocalyptic number.

It is an amenable number.

120136553 is a deficient number, since it is larger than the sum of its proper divisors (251287).

120136553 is an equidigital number, since it uses as much as digits as its factorization.

120136553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251286.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 120136553 is about 10960.6821411808. The cubic root of 120136553 is about 493.4294376422.

Adding to 120136553 its reverse (355631021), we get a palindrome (475767574).

The spelling of 120136553 in words is "one hundred twenty million, one hundred thirty-six thousand, five hundred fifty-three".