53991213 has 8 divisors (see below), whose sum is σ = 73063008. Its totient is φ = 35456784.

The previous prime is 53991209. The next prime is 53991229. The reversal of 53991213 is 31219935.

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

It is not a de Polignac number, because 53991213 - 2² = 53991209 is a prime.

It is a super-2 number, since 2×53991213² = 5830102162422738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53991263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134106 + ... + 134507.

It is an arithmetic number, because the mean of its divisors is an integer number (9132876).

Almost surely, 2^53991213 is an apocalyptic number.

It is an amenable number.

53991213 is a deficient number, since it is larger than the sum of its proper divisors (19071795).

53991213 is a wasteful number, since it uses less digits than its factorization.

53991213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268683.

The product of its digits is 7290, while the sum is 33.

The square root of 53991213 is about 7347.8713244041. The cubic root of 53991213 is about 377.9558121410.

The spelling of 53991213 in words is "fifty-three million, nine hundred ninety-one thousand, two hundred thirteen".