15121109479 has 6 divisors (see below), whose sum is σ = 17589862104. Its totient is φ = 12960950940.

The previous prime is 15121109453. The next prime is 15121109491. The reversal of 15121109479 is 97490112151.

It is not a de Polignac number, because 15121109479 - 2⁵ = 15121109447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15121109429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 154296987 + ... + 154297084.

It is an arithmetic number, because the mean of its divisors is an integer number (2931643684).

Almost surely, 2^15121109479 is an apocalyptic number.

15121109479 is a deficient number, since it is larger than the sum of its proper divisors (2468752625).

15121109479 is an equidigital number, since it uses as much as digits as its factorization.

15121109479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308594085 (or 308594078 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 40.

The spelling of 15121109479 in words is "fifteen billion, one hundred twenty-one million, one hundred nine thousand, four hundred seventy-nine".