63160721 has 4 divisors (see below), whose sum is σ = 68019252. Its totient is φ = 58302192.

The previous prime is 63160711. The next prime is 63160723. The reversal of 63160721 is 12706136.

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 7075600 + 56085121 = 2660^2 + 7489^2 .

It is a de Polignac number, because none of the positive numbers 2^k-63160721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63160723) 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, 2429246 + ... + 2429271.

It is an arithmetic number, because the mean of its divisors is an integer number (17004813).

Almost surely, 2^63160721 is an apocalyptic number.

It is an amenable number.

63160721 is a deficient number, since it is larger than the sum of its proper divisors (4858531).

63160721 is a wasteful number, since it uses less digits than its factorization.

63160721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4858530.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 63160721 is about 7947.3719555586. The cubic root of 63160721 is about 398.2438027962.

Adding to 63160721 its reverse (12706136), we get a palindrome (75866857).

The spelling of 63160721 in words is "sixty-three million, one hundred sixty thousand, seven hundred twenty-one".