53211987 has 12 divisors (see below), whose sum is σ = 76962600. Its totient is φ = 35428128.

The previous prime is 53211971. The next prime is 53212007. The reversal of 53211987 is 78911235.

53211987 is a `hidden beast` number, since 532 + 119 + 8 + 7 = 666.

It is not a de Polignac number, because 53211987 - 2⁴ = 53211971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53211967) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4264 + ... + 11162.

It is an arithmetic number, because the mean of its divisors is an integer number (6413550).

Almost surely, 2^53211987 is an apocalyptic number.

53211987 is a deficient number, since it is larger than the sum of its proper divisors (23750613).

53211987 is a wasteful number, since it uses less digits than its factorization.

53211987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7762 (or 7759 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 53211987 is about 7294.6546868238. The cubic root of 53211987 is about 376.1287165884.

The spelling of 53211987 in words is "fifty-three million, two hundred eleven thousand, nine hundred eighty-seven".