55172797 has 4 divisors (see below), whose sum is σ = 55211776. Its totient is φ = 55133820.

The previous prime is 55172771. The next prime is 55172801. The reversal of 55172797 is 79727155.

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.

It is a cyclic number.

It is not a de Polignac number, because 55172797 - 2⁷ = 55172669 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 (55182797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17283 + ... + 20224.

It is an arithmetic number, because the mean of its divisors is an integer number (13802944).

Almost surely, 2^55172797 is an apocalyptic number.

It is an amenable number.

55172797 is a deficient number, since it is larger than the sum of its proper divisors (38979).

55172797 is a wasteful number, since it uses less digits than its factorization.

55172797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38978.

The product of its digits is 154350, while the sum is 43.

The square root of 55172797 is about 7427.8393224409. The cubic root of 55172797 is about 380.6930956419.

The spelling of 55172797 in words is "fifty-five million, one hundred seventy-two thousand, seven hundred ninety-seven".