53691973 has 4 divisors (see below), whose sum is σ = 53864928. Its totient is φ = 53519020.

The previous prime is 53691971. The next prime is 53691977. The reversal of 53691973 is 37919635.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 53691973 - 2¹ = 53691971 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 (53691971) 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, 86011 + ... + 86632.

It is an arithmetic number, because the mean of its divisors is an integer number (13466232).

Almost surely, 2^53691973 is an apocalyptic number.

It is an amenable number.

53691973 is a deficient number, since it is larger than the sum of its proper divisors (172955).

53691973 is a wasteful number, since it uses less digits than its factorization.

53691973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172954.

The product of its digits is 153090, while the sum is 43.

The square root of 53691973 is about 7327.4806721001. The cubic root of 53691973 is about 377.2562594817.

The spelling of 53691973 in words is "fifty-three million, six hundred ninety-one thousand, nine hundred seventy-three".