55051531 has 4 divisors (see below), whose sum is σ = 57949000. Its totient is φ = 52154064.

The previous prime is 55051519. The next prime is 55051537. The reversal of 55051531 is 13515055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13515055 = 5 ⋅2703011.

It is a cyclic number.

It is not a de Polignac number, because 55051531 - 2¹⁵ = 55018763 is a prime.

It is a super-2 number, since 2×55051531² = 6061342130887922, 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 = 55051496 and 55051505.

It is not an unprimeable number, because it can be changed into a prime (55051537) 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, 1448706 + ... + 1448743.

It is an arithmetic number, because the mean of its divisors is an integer number (14487250).

Almost surely, 2^55051531 is an apocalyptic number.

55051531 is a deficient number, since it is larger than the sum of its proper divisors (2897469).

55051531 is a wasteful number, since it uses less digits than its factorization.

55051531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2897468.

The product of its (nonzero) digits is 1875, while the sum is 25.

The square root of 55051531 is about 7419.6718930152. The cubic root of 55051531 is about 380.4139786652.

Adding to 55051531 its reverse (13515055), we get a palindrome (68566586).

The spelling of 55051531 in words is "fifty-five million, fifty-one thousand, five hundred thirty-one".