55281501 has 32 divisors (see below), whose sum is σ = 94608000. Its totient is φ = 31530240.

The previous prime is 55281497. The next prime is 55281517. The reversal of 55281501 is 10518255.

It is not a de Polignac number, because 55281501 - 2² = 55281497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55281001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 426 + ... + 10523.

It is an arithmetic number, because the mean of its divisors is an integer number (2956500).

Almost surely, 2^55281501 is an apocalyptic number.

55281501 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

55281501 is a deficient number, since it is larger than the sum of its proper divisors (39326499).

55281501 is a wasteful number, since it uses less digits than its factorization.

55281501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10986 (or 10980 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The square root of 55281501 is about 7435.1530582766. The cubic root of 55281501 is about 380.9429513442.

Adding to 55281501 its reverse (10518255), we get a palindrome (65799756).

The spelling of 55281501 in words is "fifty-five million, two hundred eighty-one thousand, five hundred one".