53739521 has 4 divisors (see below), whose sum is σ = 58624944. Its totient is φ = 48854100.

The previous prime is 53739493. The next prime is 53739527. The reversal of 53739521 is 12593735.

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 a de Polignac number, because none of the positive numbers 2^k-53739521 is a prime.

It is a super-2 number, since 2×53739521² = 5775872234618882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53739527) 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, 2442695 + ... + 2442716.

It is an arithmetic number, because the mean of its divisors is an integer number (14656236).

It is a Proth number, since it is equal to 205 ⋅ 2¹⁸ + 1 and 205 < 2¹⁸.

Almost surely, 2^53739521 is an apocalyptic number.

It is an amenable number.

53739521 is a deficient number, since it is larger than the sum of its proper divisors (4885423).

53739521 is a wasteful number, since it uses less digits than its factorization.

53739521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4885422.

The product of its digits is 28350, while the sum is 35.

The square root of 53739521 is about 7330.7244526036. The cubic root of 53739521 is about 377.3675888988.

The spelling of 53739521 in words is "fifty-three million, seven hundred thirty-nine thousand, five hundred twenty-one".