53871665 has 4 divisors (see below), whose sum is σ = 64646004. Its totient is φ = 43097328.

The previous prime is 53871659. The next prime is 53871673. The reversal of 53871665 is 56617835.

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

It can be written as a sum of positive squares in 2 ways, for example, as 42393121 + 11478544 = 6511^2 + 3388^2 .

It is a cyclic number.

It is not a de Polignac number, because 53871665 - 2⁸ = 53871409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5387162 + ... + 5387171.

It is an arithmetic number, because the mean of its divisors is an integer number (16161501).

Almost surely, 2^53871665 is an apocalyptic number.

It is an amenable number.

53871665 is a deficient number, since it is larger than the sum of its proper divisors (10774339).

53871665 is a wasteful number, since it uses less digits than its factorization.

53871665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10774338.

The product of its digits is 151200, while the sum is 41.

The square root of 53871665 is about 7339.7319433342. The cubic root of 53871665 is about 377.6766478790.

The spelling of 53871665 in words is "fifty-three million, eight hundred seventy-one thousand, six hundred sixty-five".