55443631 has 4 divisors (see below), whose sum is σ = 55579600. Its totient is φ = 55307664.

The previous prime is 55443623. The next prime is 55443643. The reversal of 55443631 is 13634455.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13634455 = 5 ⋅2726891.

It is a cyclic number.

It is not a de Polignac number, because 55443631 - 2³ = 55443623 is a prime.

It is a super-2 number, since 2×55443631² = 6147992436928322, 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 = 55443593 and 55443602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52443631) 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, 67371 + ... + 68188.

It is an arithmetic number, because the mean of its divisors is an integer number (13894900).

Almost surely, 2^55443631 is an apocalyptic number.

55443631 is a deficient number, since it is larger than the sum of its proper divisors (135969).

55443631 is a wasteful number, since it uses less digits than its factorization.

55443631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135968.

The product of its digits is 21600, while the sum is 31.

The square root of 55443631 is about 7446.0480122008. The cubic root of 55443631 is about 381.3149986464.

The spelling of 55443631 in words is "fifty-five million, four hundred forty-three thousand, six hundred thirty-one".