55120431 has 12 divisors (see below), whose sum is σ = 74625432. Its totient is φ = 36189648.

The previous prime is 55120423. The next prime is 55120451. The reversal of 55120431 is 13402155.

It is not a de Polignac number, because 55120431 - 2³ = 55120423 is a prime.

It is a super-2 number, since 2×55120431² = 6076523827251522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55120398 and 55120407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55120451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11421 + ... + 15513.

It is an arithmetic number, because the mean of its divisors is an integer number (6218786).

Almost surely, 2^55120431 is an apocalyptic number.

55120431 is a deficient number, since it is larger than the sum of its proper divisors (19505001).

55120431 is an equidigital number, since it uses as much as digits as its factorization.

55120431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4230 (or 4163 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 55120431 is about 7424.3135036177. The cubic root of 55120431 is about 380.5726154649.

Adding to 55120431 its reverse (13402155), we get a palindrome (68522586).

The spelling of 55120431 in words is "fifty-five million, one hundred twenty thousand, four hundred thirty-one".