55211550 has 24 divisors (see below), whose sum is σ = 136925016. Its totient is φ = 14723040.

The previous prime is 55211537. The next prime is 55211557. The reversal of 55211550 is 5511255.

It is a self number, because there is not a number n which added to its sum of digits gives 55211550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55211557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 183889 + ... + 184188.

It is an arithmetic number, because the mean of its divisors is an integer number (5705209).

Almost surely, 2^55211550 is an apocalyptic number.

55211550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55211550 is an abundant number, since it is smaller than the sum of its proper divisors (81713466).

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

55211550 is a wasteful number, since it uses less digits than its factorization.

55211550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368092 (or 368087 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 24.

The square root of 55211550 is about 7430.4474966182. The cubic root of 55211550 is about 380.7822068679.

The spelling of 55211550 in words is "fifty-five million, two hundred eleven thousand, five hundred fifty".