55121950 has 48 divisors (see below), whose sum is σ = 111399120. Its totient is φ = 20171520.

The previous prime is 55121947. The next prime is 55121959. The reversal of 55121950 is 5912155.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55121959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88741 + ... + 89359.

It is an arithmetic number, because the mean of its divisors is an integer number (2320815).

Almost surely, 2^55121950 is an apocalyptic number.

55121950 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55121950 is an abundant number, since it is smaller than the sum of its proper divisors (56277170).

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

55121950 is a wasteful number, since it uses less digits than its factorization.

55121950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781 (or 776 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 28.

The square root of 55121950 is about 7424.4158019335. The cubic root of 55121950 is about 380.5761113525.

The spelling of 55121950 in words is "fifty-five million, one hundred twenty-one thousand, nine hundred fifty".