55393121 has 16 divisors (see below), whose sum is σ = 65071104. Its totient is φ = 46175184.

The previous prime is 55393099. The next prime is 55393133. The reversal of 55393121 is 12139355.

It is a cyclic number.

It is not a de Polignac number, because 55393121 - 2²² = 51198817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55393171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38216 + ... + 39638.

It is an arithmetic number, because the mean of its divisors is an integer number (4066944).

Almost surely, 2^55393121 is an apocalyptic number.

It is an amenable number.

55393121 is a deficient number, since it is larger than the sum of its proper divisors (9677983).

55393121 is a wasteful number, since it uses less digits than its factorization.

55393121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580.

The product of its digits is 4050, while the sum is 29.

The square root of 55393121 is about 7442.6555072770. The cubic root of 55393121 is about 381.1991688569.

The spelling of 55393121 in words is "fifty-five million, three hundred ninety-three thousand, one hundred twenty-one".