55373281 has 4 divisors (see below), whose sum is σ = 55388464. Its totient is φ = 55358100.

The previous prime is 55373273. The next prime is 55373303. The reversal of 55373281 is 18237355.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 55373281 - 2³ = 55373273 is a prime.

It is a super-2 number, since 2×55373281² = 6132400497409922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55373221) 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, 1546 + ... + 10636.

It is an arithmetic number, because the mean of its divisors is an integer number (13847116).

Almost surely, 2^55373281 is an apocalyptic number.

It is an amenable number.

55373281 is a deficient number, since it is larger than the sum of its proper divisors (15183).

55373281 is an equidigital number, since it uses as much as digits as its factorization.

55373281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15182.

The product of its digits is 25200, while the sum is 34.

The square root of 55373281 is about 7441.3225303033. The cubic root of 55373281 is about 381.1536524071.

The spelling of 55373281 in words is "fifty-five million, three hundred seventy-three thousand, two hundred eighty-one".