55135831 has 4 divisors (see below), whose sum is σ = 55912464. Its totient is φ = 54359200.

The previous prime is 55135823. The next prime is 55135837. The reversal of 55135831 is 13853155.

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 55135831 - 2³ = 55135823 is a prime.

It is a super-2 number, since 2×55135831² = 6079919720121122, 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 = 55135793 and 55135802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55135837) 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, 388210 + ... + 388351.

It is an arithmetic number, because the mean of its divisors is an integer number (13978116).

Almost surely, 2^55135831 is an apocalyptic number.

55135831 is a deficient number, since it is larger than the sum of its proper divisors (776633).

55135831 is an equidigital number, since it uses as much as digits as its factorization.

55135831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776632.

The product of its digits is 9000, while the sum is 31.

The square root of 55135831 is about 7425.3505641148. The cubic root of 55135831 is about 380.6080546686.

Adding to 55135831 its reverse (13853155), we get a palindrome (68988986).

The spelling of 55135831 in words is "fifty-five million, one hundred thirty-five thousand, eight hundred thirty-one".