55147409 has 4 divisors (see below), whose sum is σ = 55181604. Its totient is φ = 55113216.

The previous prime is 55147397. The next prime is 55147447. The reversal of 55147409 is 90474155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90474155 = 5 ⋅18094831.

It can be written as a sum of positive squares in 2 ways, for example, as 49843600 + 5303809 = 7060^2 + 2303^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55147409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55147489) 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, 14552 + ... + 17945.

It is an arithmetic number, because the mean of its divisors is an integer number (13795401).

Almost surely, 2^55147409 is an apocalyptic number.

It is an amenable number.

55147409 is a deficient number, since it is larger than the sum of its proper divisors (34195).

55147409 is a wasteful number, since it uses less digits than its factorization.

55147409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34194.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 55147409 is about 7426.1301496809. The cubic root of 55147409 is about 380.6346941609.

The spelling of 55147409 in words is "fifty-five million, one hundred forty-seven thousand, four hundred nine".