15909242401 has 12 divisors (see below), whose sum is σ = 17288526060. Its totient is φ = 14633149440.

The previous prime is 15909242399. The next prime is 15909242407. The reversal of 15909242401 is 10424290951.

It can be written as a sum of positive squares in 6 ways, for example, as 4001195025 + 11908047376 = 63255^2 + 109124^2 .

It is not a de Polignac number, because 15909242401 - 2¹ = 15909242399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15909242407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120016 + ... + 214993.

It is an arithmetic number, because the mean of its divisors is an integer number (1440710505).

Almost surely, 2^15909242401 is an apocalyptic number.

It is an amenable number.

15909242401 is a deficient number, since it is larger than the sum of its proper divisors (1379283659).

15909242401 is a wasteful number, since it uses less digits than its factorization.

15909242401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335316 (or 335303 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 15909242401 in words is "fifteen billion, nine hundred nine million, two hundred forty-two thousand, four hundred one".