55771222 has 8 divisors (see below), whose sum is σ = 90092016. Its totient is φ = 25740552.

The previous prime is 55771189. The next prime is 55771223. The reversal of 55771222 is 22217755.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×55771222² = 6220858406746568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55771223) 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, 1072498 + ... + 1072549.

It is an arithmetic number, because the mean of its divisors is an integer number (11261502).

Almost surely, 2^55771222 is an apocalyptic number.

55771222 is a deficient number, since it is larger than the sum of its proper divisors (34320794).

55771222 is a wasteful number, since it uses less digits than its factorization.

55771222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145062.

The product of its digits is 9800, while the sum is 31.

The square root of 55771222 is about 7468.0132565496. The cubic root of 55771222 is about 382.0645295444.

Adding to 55771222 its reverse (22217755), we get a palindrome (77988977).

The spelling of 55771222 in words is "fifty-five million, seven hundred seventy-one thousand, two hundred twenty-two".