55019145 has 32 divisors (see below), whose sum is σ = 90744192. Its totient is φ = 28449792.

The previous prime is 55019137. The next prime is 55019147. The reversal of 55019145 is 54191055.

It is not a de Polignac number, because 55019145 - 2³ = 55019137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55019147) 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, 126849 + ... + 127281.

It is an arithmetic number, because the mean of its divisors is an integer number (2835756).

Almost surely, 2^55019145 is an apocalyptic number.

It is an amenable number.

55019145 is a deficient number, since it is larger than the sum of its proper divisors (35725047).

55019145 is a wasteful number, since it uses less digits than its factorization.

55019145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 55019145 is about 7417.4891304268. The cubic root of 55019145 is about 380.3393667298.

The spelling of 55019145 in words is "fifty-five million, nineteen thousand, one hundred forty-five".