53649731 has 4 divisors (see below), whose sum is σ = 55982352. Its totient is φ = 51317112.

The previous prime is 53649721. The next prime is 53649737. The reversal of 53649731 is 13794635.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53649731 is a prime.

It is a super-2 number, since 2×53649731² = 5756587272744722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53649737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1166276 + ... + 1166321.

It is an arithmetic number, because the mean of its divisors is an integer number (13995588).

Almost surely, 2^53649731 is an apocalyptic number.

53649731 is a deficient number, since it is larger than the sum of its proper divisors (2332621).

53649731 is a wasteful number, since it uses less digits than its factorization.

53649731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332620.

The product of its digits is 68040, while the sum is 38.

The square root of 53649731 is about 7324.5976681317. The cubic root of 53649731 is about 377.1572984448.

The spelling of 53649731 in words is "fifty-three million, six hundred forty-nine thousand, seven hundred thirty-one".