120531553 has 2 divisors, whose sum is σ = 120531554. Its totient is φ = 120531552.

The previous prime is 120531493. The next prime is 120531557. The reversal of 120531553 is 355135021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68359824 + 52171729 = 8268^2 + 7223^2 .

It is an emirp because it is prime and its reverse (355135021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120531553 - 2¹⁷ = 120400481 is a prime.

It is not a weakly prime, because it can be changed into another prime (120531557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60265776 + 60265777.

It is an arithmetic number, because the mean of its divisors is an integer number (60265777).

Almost surely, 2^120531553 is an apocalyptic number.

It is an amenable number.

120531553 is a deficient number, since it is larger than the sum of its proper divisors (1).

120531553 is an equidigital number, since it uses as much as digits as its factorization.

120531553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 120531553 is about 10978.6863057471. The cubic root of 120531553 is about 493.9696323949.

Adding to 120531553 its reverse (355135021), we get a palindrome (475666574).

The spelling of 120531553 in words is "one hundred twenty million, five hundred thirty-one thousand, five hundred fifty-three".