53405213 has 4 divisors (see below), whose sum is σ = 53594208. Its totient is φ = 53216220.

The previous prime is 53405201. The next prime is 53405239. The reversal of 53405213 is 31250435.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31250435 = 5 ⋅6250087.

It is a cyclic number.

It is not a de Polignac number, because 53405213 - 2⁸ = 53404957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53405243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94073 + ... + 94638.

It is an arithmetic number, because the mean of its divisors is an integer number (13398552).

Almost surely, 2^53405213 is an apocalyptic number.

It is an amenable number.

53405213 is a deficient number, since it is larger than the sum of its proper divisors (188995).

53405213 is a wasteful number, since it uses less digits than its factorization.

53405213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188994.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 53405213 is about 7307.8870407252. The cubic root of 53405213 is about 376.5834390301.

Adding to 53405213 its reverse (31250435), we get a palindrome (84655648).

The spelling of 53405213 in words is "fifty-three million, four hundred five thousand, two hundred thirteen".