130121555 has 4 divisors (see below), whose sum is σ = 156145872. Its totient is φ = 104097240.

The previous prime is 130121543. The next prime is 130121591. The reversal of 130121555 is 555121031.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 130121555 - 2¹² = 130117459 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 130121555.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 13012151 + ... + 13012160.

It is an arithmetic number, because the mean of its divisors is an integer number (39036468).

Almost surely, 2^130121555 is an apocalyptic number.

130121555 is a deficient number, since it is larger than the sum of its proper divisors (26024317).

130121555 is an equidigital number, since it uses as much as digits as its factorization.

130121555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26024316.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 130121555 is about 11407.0835448856. The cubic root of 130121555 is about 506.7375432261.

Adding to 130121555 its reverse (555121031), we get a palindrome (685242586).

The spelling of 130121555 in words is "one hundred thirty million, one hundred twenty-one thousand, five hundred fifty-five".