15420084209 has 4 divisors (see below), whose sum is σ = 16327148004. Its totient is φ = 14513020416.

The previous prime is 15420084203. The next prime is 15420084241. The reversal of 15420084209 is 90248002451.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7242861025 + 8177223184 = 85105^2 + 90428^2 .

It is a cyclic number.

It is not a de Polignac number, because 15420084209 - 2¹² = 15420080113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15420084203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453531872 + ... + 453531905.

It is an arithmetic number, because the mean of its divisors is an integer number (4081787001).

Almost surely, 2^15420084209 is an apocalyptic number.

It is an amenable number.

15420084209 is a deficient number, since it is larger than the sum of its proper divisors (907063795).

15420084209 is an equidigital number, since it uses as much as digits as its factorization.

15420084209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907063794.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 15420084209 in words is "fifteen billion, four hundred twenty million, eighty-four thousand, two hundred nine".