55531000 has 64 divisors (see below), whose sum is σ = 148524480. Its totient is φ = 19036800.

The previous prime is 55530997. The next prime is 55531001. The reversal of 55531000 is 13555.

It is a super-2 number, since 2×55531000² = 6167383922000000, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55531001) 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, 3034 + ... + 10966.

It is an arithmetic number, because the mean of its divisors is an integer number (2320695).

Almost surely, 2^55531000 is an apocalyptic number.

55531000 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 55531000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74262240).

55531000 is an abundant number, since it is smaller than the sum of its proper divisors (92993480).

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

55531000 is a wasteful number, since it uses less digits than its factorization.

55531000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7961 (or 7947 counting only the distinct ones).

The product of its (nonzero) digits is 375, while the sum is 19.

The square root of 55531000 is about 7451.9125061960. The cubic root of 55531000 is about 381.5151877112.

Adding to 55531000 its reverse (13555), we get a palindrome (55544555).

The spelling of 55531000 in words is "fifty-five million, five hundred thirty-one thousand".