55231000 has 64 divisors (see below), whose sum is σ = 141017760. Its totient is φ = 20080000.

The previous prime is 55230953. The next prime is 55231009. The reversal of 55231000 is 13255.

It is a super-2 number, since 2×55231000² = 6100926722000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55231009) 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, 8490 + ... + 13510.

Almost surely, 2^55231000 is an apocalyptic number.

55231000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55231000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70508880).

55231000 is an abundant number, since it is smaller than the sum of its proper divisors (85786760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55231000 is a wasteful number, since it uses less digits than its factorization.

55231000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5053 (or 5039 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 55231000 is about 7431.7561854517. The cubic root of 55231000 is about 380.8269157763.

Adding to 55231000 its reverse (13255), we get a palindrome (55244255).

The spelling of 55231000 in words is "fifty-five million, two hundred thirty-one thousand".