55144431 has 6 divisors (see below), whose sum is σ = 79653080. Its totient is φ = 36762948.

The previous prime is 55144423. The next prime is 55144469. The reversal of 55144431 is 13444155.

It is a happy number.

It is not a de Polignac number, because 55144431 - 2³ = 55144423 is a prime.

It is a super-2 number, since 2×55144431² = 6081816540627522, 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 = 55144395 and 55144404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55144421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3063571 + ... + 3063588.

Almost surely, 2^55144431 is an apocalyptic number.

55144431 is a deficient number, since it is larger than the sum of its proper divisors (24508649).

55144431 is a wasteful number, since it uses less digits than its factorization.

55144431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6127165 (or 6127162 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 55144431 is about 7425.9296387725. The cubic root of 55144431 is about 380.6278425213.

Adding to 55144431 its reverse (13444155), we get a palindrome (68588586).

The spelling of 55144431 in words is "fifty-five million, one hundred forty-four thousand, four hundred thirty-one".