53815247 has 4 divisors (see below), whose sum is σ = 55127856. Its totient is φ = 52502640.

The previous prime is 53815243. The next prime is 53815253. The reversal of 53815247 is 74251835.

It is a happy number.

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 53815247 - 2² = 53815243 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 (53815243) 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, 656243 + ... + 656324.

It is an arithmetic number, because the mean of its divisors is an integer number (13781964).

Almost surely, 2^53815247 is an apocalyptic number.

53815247 is a deficient number, since it is larger than the sum of its proper divisors (1312609).

53815247 is a wasteful number, since it uses less digits than its factorization.

53815247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312608.

The product of its digits is 33600, while the sum is 35.

The square root of 53815247 is about 7335.8876081903. The cubic root of 53815247 is about 377.5447591037.

The spelling of 53815247 in words is "fifty-three million, eight hundred fifteen thousand, two hundred forty-seven".