55215473 has 6 divisors (see below), whose sum is σ = 58654806. Its totient is φ = 51967232.

The previous prime is 55215467. The next prime is 55215491. The reversal of 55215473 is 37451255.

It can be written as a sum of positive squares in 3 ways, for example, as 39589264 + 15626209 = 6292^2 + 3953^2 .

It is not a de Polignac number, because 55215473 - 2¹⁰ = 55214449 is a prime.

It is a super-2 number, since 2×55215473² = 6097496917227458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55215073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 95240 + ... + 95817.

It is an arithmetic number, because the mean of its divisors is an integer number (9775801).

Almost surely, 2^55215473 is an apocalyptic number.

It is an amenable number.

55215473 is a deficient number, since it is larger than the sum of its proper divisors (3439333).

55215473 is a wasteful number, since it uses less digits than its factorization.

55215473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191091 (or 191074 counting only the distinct ones).

The product of its digits is 21000, while the sum is 32.

The square root of 55215473 is about 7430.7114733382. The cubic root of 55215473 is about 380.7912253505.

The spelling of 55215473 in words is "fifty-five million, two hundred fifteen thousand, four hundred seventy-three".