55031520 has 48 divisors (see below), whose sum is σ = 173350800. Its totient is φ = 14674944.

The previous prime is 55031519. The next prime is 55031521. The reversal of 55031520 is 2513055.

It is an interprime number because it is at equal distance from previous prime (55031519) and next prime (55031521).

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55031521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56845 + ... + 57804.

It is an arithmetic number, because the mean of its divisors is an integer number (3611475).

Almost surely, 2^55031520 is an apocalyptic number.

It is an amenable number.

55031520 is an abundant number, since it is smaller than the sum of its proper divisors (118319280).

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

55031520 is a wasteful number, since it uses less digits than its factorization.

55031520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114667 (or 114659 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 55031520 is about 7418.3232606836. The cubic root of 55031520 is about 380.3678801187.

Adding to 55031520 its reverse (2513055), we get a palindrome (57544575).

The spelling of 55031520 in words is "fifty-five million, thirty-one thousand, five hundred twenty".