55505397 has 4 divisors (see below), whose sum is σ = 74007200. Its totient is φ = 37003596.

The previous prime is 55505383. The next prime is 55505419. The reversal of 55505397 is 79350555.

It is a happy number.

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 not a de Polignac number, because 55505397 - 2¹² = 55501301 is a prime.

It is a super-2 number, since 2×55505397² = 6161698192255218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55505377) 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, 9250897 + ... + 9250902.

It is an arithmetic number, because the mean of its divisors is an integer number (18501800).

Almost surely, 2^55505397 is an apocalyptic number.

It is an amenable number.

55505397 is a deficient number, since it is larger than the sum of its proper divisors (18501803).

55505397 is a wasteful number, since it uses less digits than its factorization.

55505397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18501802.

The product of its (nonzero) digits is 118125, while the sum is 39.

The square root of 55505397 is about 7450.1944269932. The cubic root of 55505397 is about 381.4565451817.

The spelling of 55505397 in words is "fifty-five million, five hundred five thousand, three hundred ninety-seven".