55421503 has 2 divisors, whose sum is σ = 55421504. Its totient is φ = 55421502.

The previous prime is 55421497. The next prime is 55421533. The reversal of 55421503 is 30512455.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55421503 - 2²⁵ = 21867071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55421533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27710751 + 27710752.

It is an arithmetic number, because the mean of its divisors is an integer number (27710752).

Almost surely, 2^55421503 is an apocalyptic number.

55421503 is a deficient number, since it is larger than the sum of its proper divisors (1).

55421503 is an equidigital number, since it uses as much as digits as its factorization.

55421503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 55421503 is about 7444.5619750258. The cubic root of 55421503 is about 381.2642632664.

Adding to 55421503 its reverse (30512455), we get a palindrome (85933958).

The spelling of 55421503 in words is "fifty-five million, four hundred twenty-one thousand, five hundred three".