55147969 has 4 divisors (see below), whose sum is σ = 55168960. Its totient is φ = 55126980.

The previous prime is 55147943. The next prime is 55147979. The reversal of 55147969 is 96974155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96974155 = 5 ⋅19394831.

It is a cyclic number.

It is not a de Polignac number, because 55147969 - 2¹⁵ = 55115201 is a prime.

It is a super-2 number, since 2×55147969² = 6082596969649922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55147979) 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, 5877 + ... + 12034.

It is an arithmetic number, because the mean of its divisors is an integer number (13792240).

Almost surely, 2^55147969 is an apocalyptic number.

55147969 is the 4288-th hex number.

It is an amenable number.

55147969 is a deficient number, since it is larger than the sum of its proper divisors (20991).

55147969 is a wasteful number, since it uses less digits than its factorization.

55147969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20990.

The product of its digits is 340200, while the sum is 46.

The square root of 55147969 is about 7426.1678542839. The cubic root of 55147969 is about 380.6359825545.

The spelling of 55147969 in words is "fifty-five million, one hundred forty-seven thousand, nine hundred sixty-nine".