53311551 has 4 divisors (see below), whose sum is σ = 71082072. Its totient is φ = 35541032.

The previous prime is 53311547. The next prime is 53311553. The reversal of 53311551 is 15511335.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 53311551 - 2² = 53311547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53311553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8885256 + ... + 8885261.

It is an arithmetic number, because the mean of its divisors is an integer number (17770518).

Almost surely, 2^53311551 is an apocalyptic number.

53311551 is a deficient number, since it is larger than the sum of its proper divisors (17770521).

53311551 is a wasteful number, since it uses less digits than its factorization.

53311551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17770520.

The product of its digits is 1125, while the sum is 24.

The square root of 53311551 is about 7301.4759466837. The cubic root of 53311551 is about 376.3631596732.

Adding to 53311551 its reverse (15511335), we get a palindrome (68822886).

The spelling of 53311551 in words is "fifty-three million, three hundred eleven thousand, five hundred fifty-one".