55531633 has 4 divisors (see below), whose sum is σ = 57323008. Its totient is φ = 53740260.

The previous prime is 55531631. The next prime is 55531643. The reversal of 55531633 is 33613555.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55531633 - 2¹ = 55531631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 1791343 = 55531633 / (5 + 5 + 5 + 3 + 1 + 6 + 3 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55531595 and 55531604.

It is not an unprimeable number, because it can be changed into a prime (55531631) 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, 895641 + ... + 895702.

It is an arithmetic number, because the mean of its divisors is an integer number (14330752).

Almost surely, 2^55531633 is an apocalyptic number.

It is an amenable number.

55531633 is a deficient number, since it is larger than the sum of its proper divisors (1791375).

55531633 is a wasteful number, since it uses less digits than its factorization.

55531633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791374.

The product of its digits is 20250, while the sum is 31.

The square root of 55531633 is about 7451.9549783933. The cubic root of 55531633 is about 381.5166373412.

The spelling of 55531633 in words is "fifty-five million, five hundred thirty-one thousand, six hundred thirty-three".