53445551 has 4 divisors (see below), whose sum is σ = 53464704. Its totient is φ = 53426400.

The previous prime is 53445547. The next prime is 53445589. The reversal of 53445551 is 15554435.

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 53445551 - 2² = 53445547 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 (53445541) 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, 4490 + ... + 11271.

It is an arithmetic number, because the mean of its divisors is an integer number (13366176).

Almost surely, 2^53445551 is an apocalyptic number.

53445551 is a deficient number, since it is larger than the sum of its proper divisors (19153).

53445551 is a wasteful number, since it uses less digits than its factorization.

53445551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19152.

The product of its digits is 30000, while the sum is 32.

The square root of 53445551 is about 7310.6464146476. The cubic root of 53445551 is about 376.6782287764.

Adding to 53445551 its reverse (15554435), we get a palindrome (68999986).

The spelling of 53445551 in words is "fifty-three million, four hundred forty-five thousand, five hundred fifty-one".