53991385 has 12 divisors (see below), whose sum is σ = 75367908. Its totient is φ = 37022496.

The previous prime is 53991361. The next prime is 53991401. The reversal of 53991385 is 58319935.

It can be written as a sum of positive squares in 2 ways, for example, as 32387481 + 21603904 = 5691^2 + 4648^2 .

It is not a de Polignac number, because 53991385 - 2²⁵ = 20436953 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109942 + ... + 110431.

It is an arithmetic number, because the mean of its divisors is an integer number (6280659).

Almost surely, 2^53991385 is an apocalyptic number.

It is an amenable number.

53991385 is a deficient number, since it is larger than the sum of its proper divisors (21376523).

53991385 is a wasteful number, since it uses less digits than its factorization.

53991385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220392 (or 220385 counting only the distinct ones).

The product of its digits is 145800, while the sum is 43.

The square root of 53991385 is about 7347.8830284647. The cubic root of 53991385 is about 377.9562134923.

The spelling of 53991385 in words is "fifty-three million, nine hundred ninety-one thousand, three hundred eighty-five".