55121972 has 24 divisors (see below), whose sum is σ = 99046080. Its totient is φ = 26832960.

The previous prime is 55121959. The next prime is 55121977. The reversal of 55121972 is 27912155.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55121977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22697 + ... + 25007.

It is an arithmetic number, because the mean of its divisors is an integer number (4126920).

Almost surely, 2^55121972 is an apocalyptic number.

It is an amenable number.

55121972 is a deficient number, since it is larger than the sum of its proper divisors (43924108).

55121972 is a wasteful number, since it uses less digits than its factorization.

55121972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471 (or 2469 counting only the distinct ones).

The product of its digits is 6300, while the sum is 32.

The square root of 55121972 is about 7424.4172835314. The cubic root of 55121972 is about 380.5761619837.

The spelling of 55121972 in words is "fifty-five million, one hundred twenty-one thousand, nine hundred seventy-two".