53991311 has 16 divisors (see below), whose sum is σ = 60611328. Its totient is φ = 47678400.

The previous prime is 53991299. The next prime is 53991317. The reversal of 53991311 is 11319935.

It is a happy number.

It is not a de Polignac number, because 53991311 - 2⁶ = 53991247 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 (53991317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56540 + ... + 57486.

It is an arithmetic number, because the mean of its divisors is an integer number (3788208).

Almost surely, 2^53991311 is an apocalyptic number.

53991311 is a deficient number, since it is larger than the sum of its proper divisors (6620017).

53991311 is a wasteful number, since it uses less digits than its factorization.

53991311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102.

The product of its digits is 3645, while the sum is 32.

The square root of 53991311 is about 7347.8779929991. The cubic root of 53991311 is about 377.9560408180.

The spelling of 53991311 in words is "fifty-three million, nine hundred ninety-one thousand, three hundred eleven".