53381987 has 4 divisors (see below), whose sum is σ = 53871840. Its totient is φ = 52892136.

The previous prime is 53381957. The next prime is 53382013. The reversal of 53381987 is 78918335.

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 53381987 - 2¹⁰ = 53380963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53381947) 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, 244763 + ... + 244980.

It is an arithmetic number, because the mean of its divisors is an integer number (13467960).

Almost surely, 2^53381987 is an apocalyptic number.

53381987 is a deficient number, since it is larger than the sum of its proper divisors (489853).

53381987 is a wasteful number, since it uses less digits than its factorization.

53381987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489852.

The product of its digits is 181440, while the sum is 44.

The square root of 53381987 is about 7306.2977628892. The cubic root of 53381987 is about 376.5288388970.

The spelling of 53381987 in words is "fifty-three million, three hundred eighty-one thousand, nine hundred eighty-seven".