63732121 has 4 divisors (see below), whose sum is σ = 63936052. Its totient is φ = 63528192.

The previous prime is 63732101. The next prime is 63732127. The reversal of 63732121 is 12123736.

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 8065600 + 55666521 = 2840^2 + 7461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63732121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63732127) 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, 101496 + ... + 102121.

It is an arithmetic number, because the mean of its divisors is an integer number (15984013).

Almost surely, 2^63732121 is an apocalyptic number.

It is an amenable number.

63732121 is a deficient number, since it is larger than the sum of its proper divisors (203931).

63732121 is a wasteful number, since it uses less digits than its factorization.

63732121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203930.

The product of its digits is 1512, while the sum is 25.

The square root of 63732121 is about 7983.2400064134. The cubic root of 63732121 is about 399.4411382976.

Adding to 63732121 its reverse (12123736), we get a palindrome (75855857).

The spelling of 63732121 in words is "sixty-three million, seven hundred thirty-two thousand, one hundred twenty-one".