55236431 has 4 divisors (see below), whose sum is σ = 55484352. Its totient is φ = 54988512.

The previous prime is 55236427. The next prime is 55236437. The reversal of 55236431 is 13463255.

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 55236431 - 2² = 55236427 is a prime.

It is a super-2 number, since 2×55236431² = 6102126619235522, 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 = 55236394 and 55236403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55236437) 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, 123626 + ... + 124071.

It is an arithmetic number, because the mean of its divisors is an integer number (13871088).

Almost surely, 2^55236431 is an apocalyptic number.

55236431 is a deficient number, since it is larger than the sum of its proper divisors (247921).

55236431 is a wasteful number, since it uses less digits than its factorization.

55236431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247920.

The product of its digits is 10800, while the sum is 29.

The square root of 55236431 is about 7432.1215678970. The cubic root of 55236431 is about 380.8393979161.

Adding to 55236431 its reverse (13463255), we get a palindrome (68699686).

The spelling of 55236431 in words is "fifty-five million, two hundred thirty-six thousand, four hundred thirty-one".