53694721 has 4 divisors (see below), whose sum is σ = 56853252. Its totient is φ = 50536192.

The previous prime is 53694713. The next prime is 53694737. The reversal of 53694721 is 12749635.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12749635 = 5 ⋅2549927.

It can be written as a sum of positive squares in 2 ways, for example, as 50126400 + 3568321 = 7080^2 + 1889^2 .

It is a cyclic number.

It is not a de Polignac number, because 53694721 - 2³ = 53694713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53604721) 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, 1579240 + ... + 1579273.

It is an arithmetic number, because the mean of its divisors is an integer number (14213313).

Almost surely, 2^53694721 is an apocalyptic number.

It is an amenable number.

53694721 is a deficient number, since it is larger than the sum of its proper divisors (3158531).

53694721 is a wasteful number, since it uses less digits than its factorization.

53694721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3158530.

The product of its digits is 45360, while the sum is 37.

The square root of 53694721 is about 7327.6681829897. The cubic root of 53694721 is about 377.2626954687.

The spelling of 53694721 in words is "fifty-three million, six hundred ninety-four thousand, seven hundred twenty-one".