55331503 has 2 divisors, whose sum is σ = 55331504. Its totient is φ = 55331502.

The previous prime is 55331473. The next prime is 55331513. The reversal of 55331503 is 30513355.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55331503 - 2¹³ = 55323311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55331513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27665751 + 27665752.

It is an arithmetic number, because the mean of its divisors is an integer number (27665752).

Almost surely, 2^55331503 is an apocalyptic number.

55331503 is a deficient number, since it is larger than the sum of its proper divisors (1).

55331503 is an equidigital number, since it uses as much as digits as its factorization.

55331503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3375, while the sum is 25.

The square root of 55331503 is about 7438.5148383263. The cubic root of 55331503 is about 381.0577707628.

Adding to 55331503 its reverse (30513355), we get a palindrome (85844858).

The spelling of 55331503 in words is "fifty-five million, three hundred thirty-one thousand, five hundred three".