53513991 has 6 divisors (see below), whose sum is σ = 77298000. Its totient is φ = 35675988.

The previous prime is 53513989. The next prime is 53514067. The reversal of 53513991 is 19931535.

53513991 is a `hidden beast` number, since 53 + 513 + 9 + 91 = 666.

It is not a de Polignac number, because 53513991 - 2¹ = 53513989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53513491) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2972991 + ... + 2973008.

It is an arithmetic number, because the mean of its divisors is an integer number (12883000).

Almost surely, 2^53513991 is an apocalyptic number.

53513991 is a deficient number, since it is larger than the sum of its proper divisors (23784009).

53513991 is a wasteful number, since it uses less digits than its factorization.

53513991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5946005 (or 5946002 counting only the distinct ones).

The product of its digits is 18225, while the sum is 36.

The square root of 53513991 is about 7315.3257617142. The cubic root of 53513991 is about 376.8389459994.

The spelling of 53513991 in words is "fifty-three million, five hundred thirteen thousand, nine hundred ninety-one".