53913991 has 8 divisors (see below), whose sum is σ = 55738368. Its totient is φ = 52095000.

The previous prime is 53913989. The next prime is 53913997. The reversal of 53913991 is 19931935.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 53913991 - 2¹ = 53913989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53913997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34926 + ... + 36436.

It is an arithmetic number, because the mean of its divisors is an integer number (6967296).

Almost surely, 2^53913991 is an apocalyptic number.

53913991 is a deficient number, since it is larger than the sum of its proper divisors (1824377).

53913991 is a wasteful number, since it uses less digits than its factorization.

53913991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2693.

The product of its digits is 32805, while the sum is 40.

The square root of 53913991 is about 7342.6147250145. The cubic root of 53913991 is about 377.7755332399.

The spelling of 53913991 in words is "fifty-three million, nine hundred thirteen thousand, nine hundred ninety-one".