55721156 has 6 divisors (see below), whose sum is σ = 97512030. Its totient is φ = 27860576.

The previous prime is 55721131. The next prime is 55721161. The reversal of 55721156 is 65112755.

It can be written as a sum of positive squares in only one way, i.e., 45697600 + 10023556 = 6760^2 + 3166^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6965141 + ... + 6965148.

It is an arithmetic number, because the mean of its divisors is an integer number (16252005).

Almost surely, 2^55721156 is an apocalyptic number.

It is an amenable number.

55721156 is a deficient number, since it is larger than the sum of its proper divisors (41790874).

55721156 is a wasteful number, since it uses less digits than its factorization.

55721156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13930293 (or 13930291 counting only the distinct ones).

The product of its digits is 10500, while the sum is 32.

The square root of 55721156 is about 7464.6604745293. The cubic root of 55721156 is about 381.9501684767.

The spelling of 55721156 in words is "fifty-five million, seven hundred twenty-one thousand, one hundred fifty-six".