15501120109 has 2 divisors, whose sum is σ = 15501120110. Its totient is φ = 15501120108.

The previous prime is 15501120101. The next prime is 15501120161. The reversal of 15501120109 is 90102110551.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9424138084 + 6076982025 = 97078^2 + 77955^2 .

It is a cyclic number.

It is not a de Polignac number, because 15501120109 - 2³ = 15501120101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15501120101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7750560054 + 7750560055.

It is an arithmetic number, because the mean of its divisors is an integer number (7750560055).

Almost surely, 2^15501120109 is an apocalyptic number.

It is an amenable number.

15501120109 is a deficient number, since it is larger than the sum of its proper divisors (1).

15501120109 is an equidigital number, since it uses as much as digits as its factorization.

15501120109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450, while the sum is 25.

The spelling of 15501120109 in words is "fifteen billion, five hundred one million, one hundred twenty thousand, one hundred nine".