63721131 has 4 divisors (see below), whose sum is σ = 84961512. Its totient is φ = 42480752.

The previous prime is 63721111. The next prime is 63721153. The reversal of 63721131 is 13112736.

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

It is a cyclic number.

It is not a de Polignac number, because 63721131 - 2⁹ = 63720619 is a prime.

It is a super-2 number, since 2×63721131² = 8120765071838322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63721111) 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, 10620186 + ... + 10620191.

It is an arithmetic number, because the mean of its divisors is an integer number (21240378).

Almost surely, 2^63721131 is an apocalyptic number.

63721131 is a deficient number, since it is larger than the sum of its proper divisors (21240381).

63721131 is a wasteful number, since it uses less digits than its factorization.

63721131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21240380.

The product of its digits is 756, while the sum is 24.

The square root of 63721131 is about 7982.5516597138. The cubic root of 63721131 is about 399.4181770321.

Adding to 63721131 its reverse (13112736), we get a palindrome (76833867).

It can be divided in two parts, 6372 and 1131, that added together give a triangular number (7503 = T₁₂₂).

The spelling of 63721131 in words is "sixty-three million, seven hundred twenty-one thousand, one hundred thirty-one".