55421545 has 16 divisors (see below), whose sum is σ = 68397840. Its totient is φ = 43084800.

The previous prime is 55421543. The next prime is 55421551. The reversal of 55421545 is 54512455.

It can be written as a sum of positive squares in 8 ways, for example, as 127449 + 55294096 = 357^2 + 7436^2 .

It is not a de Polignac number, because 55421545 - 2¹ = 55421543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55421543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83515 + ... + 84175.

It is an arithmetic number, because the mean of its divisors is an integer number (4274865).

Almost surely, 2^55421545 is an apocalyptic number.

It is an amenable number.

55421545 is a deficient number, since it is larger than the sum of its proper divisors (12976295).

55421545 is a wasteful number, since it uses less digits than its factorization.

55421545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116.

The product of its digits is 20000, while the sum is 31.

The square root of 55421545 is about 7444.5647958763. The cubic root of 55421545 is about 381.2643595774.

The spelling of 55421545 in words is "fifty-five million, four hundred twenty-one thousand, five hundred forty-five".