53415551 has 4 divisors (see below), whose sum is σ = 61046352. Its totient is φ = 45784752.

The previous prime is 53415539. The next prime is 53415601. The reversal of 53415551 is 15551435.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15551435 = 5 ⋅3110287.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53415551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53412551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3815390 + ... + 3815403.

It is an arithmetic number, because the mean of its divisors is an integer number (15261588).

Almost surely, 2^53415551 is an apocalyptic number.

53415551 is a deficient number, since it is larger than the sum of its proper divisors (7630801).

53415551 is an equidigital number, since it uses as much as digits as its factorization.

53415551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7630800.

The product of its digits is 7500, while the sum is 29.

The square root of 53415551 is about 7308.5943244922. The cubic root of 53415551 is about 376.6077367106.

Adding to 53415551 its reverse (15551435), we get a palindrome (68966986).

The spelling of 53415551 in words is "fifty-three million, four hundred fifteen thousand, five hundred fifty-one".