53737021 has 4 divisors (see below), whose sum is σ = 57870652. Its totient is φ = 49603392.

The previous prime is 53737007. The next prime is 53737049. The reversal of 53737021 is 12073735.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22934521 + 30802500 = 4789^2 + 5550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53737021 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 (53737001) 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 3 ways as a sum of consecutive naturals, for example, 2066796 + ... + 2066821.

It is an arithmetic number, because the mean of its divisors is an integer number (14467663).

Almost surely, 2^53737021 is an apocalyptic number.

It is an amenable number.

53737021 is a deficient number, since it is larger than the sum of its proper divisors (4133631).

53737021 is a wasteful number, since it uses less digits than its factorization.

53737021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4133630.

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

The square root of 53737021 is about 7330.5539354131. The cubic root of 53737021 is about 377.3617370069.

The spelling of 53737021 in words is "fifty-three million, seven hundred thirty-seven thousand, twenty-one".