721132001 has 2 divisors, whose sum is σ = 721132002. Its totient is φ = 721132000.

The previous prime is 721131991. The next prime is 721132007. The reversal of 721132001 is 100231127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 713157025 + 7974976 = 26705^2 + 2824^2 .

It is a cyclic number.

It is not a de Polignac number, because 721132001 - 2⁶ = 721131937 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (721132007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360566000 + 360566001.

It is an arithmetic number, because the mean of its divisors is an integer number (360566001).

Almost surely, 2^721132001 is an apocalyptic number.

It is an amenable number.

721132001 is a deficient number, since it is larger than the sum of its proper divisors (1).

721132001 is an equidigital number, since it uses as much as digits as its factorization.

721132001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 721132001 is about 26853.9010387690. The cubic root of 721132001 is about 896.7504213825.

Adding to 721132001 its reverse (100231127), we get a palindrome (821363128).

The spelling of 721132001 in words is "seven hundred twenty-one million, one hundred thirty-two thousand, one".