55290031 has 4 divisors (see below), whose sum is σ = 55489912. Its totient is φ = 55090152.

The previous prime is 55290023. The next prime is 55290041. The reversal of 55290031 is 13009255.

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 55290031 - 2³ = 55290023 is a prime.

It is a super-2 number, since 2×55290031² = 6113975055961922, 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 = 55289978 and 55290005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55290041) 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, 99525 + ... + 100078.

It is an arithmetic number, because the mean of its divisors is an integer number (13872478).

Almost surely, 2^55290031 is an apocalyptic number.

55290031 is a deficient number, since it is larger than the sum of its proper divisors (199881).

55290031 is a wasteful number, since it uses less digits than its factorization.

55290031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199880.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 55290031 is about 7435.7266625394. The cubic root of 55290031 is about 380.9625436503.

Adding to 55290031 its reverse (13009255), we get a palindrome (68299286).

The spelling of 55290031 in words is "fifty-five million, two hundred ninety thousand, thirty-one".