53721307 has 4 divisors (see below), whose sum is σ = 56057040. Its totient is φ = 51385576.

The previous prime is 53721293. The next prime is 53721313. The reversal of 53721307 is 70312735.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70312735 = 5 ⋅14062547.

It is a cyclic number.

It is not a de Polignac number, because 53721307 - 2¹⁵ = 53688539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53721347) 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, 1167832 + ... + 1167877.

It is an arithmetic number, because the mean of its divisors is an integer number (14014260).

Almost surely, 2^53721307 is an apocalyptic number.

53721307 is a deficient number, since it is larger than the sum of its proper divisors (2335733).

53721307 is a wasteful number, since it uses less digits than its factorization.

53721307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2335732.

The product of its (nonzero) digits is 4410, while the sum is 28.

The square root of 53721307 is about 7329.4820417271. The cubic root of 53721307 is about 377.3249501988.

The spelling of 53721307 in words is "fifty-three million, seven hundred twenty-one thousand, three hundred seven".