55553431 has 4 divisors (see below), whose sum is σ = 55731232. Its totient is φ = 55375632.

The previous prime is 55553429. The next prime is 55553447. The reversal of 55553431 is 13435555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55553431 - 2¹ = 55553429 is a prime.

It is a super-2 number, since 2×55553431² = 6172367391743522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55553393 and 55553402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55553461) 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, 88431 + ... + 89056.

It is an arithmetic number, because the mean of its divisors is an integer number (13932808).

Almost surely, 2^55553431 is an apocalyptic number.

55553431 is a deficient number, since it is larger than the sum of its proper divisors (177801).

55553431 is a wasteful number, since it uses less digits than its factorization.

55553431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177800.

The product of its digits is 22500, while the sum is 31.

The square root of 55553431 is about 7453.4174041174. The cubic root of 55553431 is about 381.5665501044.

Adding to 55553431 its reverse (13435555), we get a palindrome (68988986).

The spelling of 55553431 in words is "fifty-five million, five hundred fifty-three thousand, four hundred thirty-one".