55212693 has 4 divisors (see below), whose sum is σ = 73616928. Its totient is φ = 36808460.

The previous prime is 55212659. The next prime is 55212709. The reversal of 55212693 is 39621255.

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 55212693 - 2⁶ = 55212629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55212293) 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, 9202113 + ... + 9202118.

It is an arithmetic number, because the mean of its divisors is an integer number (18404232).

Almost surely, 2^55212693 is an apocalyptic number.

It is an amenable number.

55212693 is a deficient number, since it is larger than the sum of its proper divisors (18404235).

55212693 is a wasteful number, since it uses less digits than its factorization.

55212693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18404234.

The product of its digits is 16200, while the sum is 33.

The square root of 55212693 is about 7430.5244094882. The cubic root of 55212693 is about 380.7848345249.

The spelling of 55212693 in words is "fifty-five million, two hundred twelve thousand, six hundred ninety-three".