4351231545721 has 2 divisors, whose sum is σ = 4351231545722. Its totient is φ = 4351231545720.

The previous prime is 4351231545707. The next prime is 4351231545863. The reversal of 4351231545721 is 1275451321534.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4335889998400 + 15341547321 = 2082280^2 + 123861^2 .

It is a cyclic number.

It is not a de Polignac number, because 4351231545721 - 2²¹ = 4351229448569 is a prime.

It is not a weakly prime, because it can be changed into another prime (4351231545701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2175615772860 + 2175615772861.

It is an arithmetic number, because the mean of its divisors is an integer number (2175615772861).

Almost surely, 2^{4351231545721} is an apocalyptic number.

It is an amenable number.

4351231545721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4351231545721 is an equidigital number, since it uses as much as digits as its factorization.

4351231545721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504000, while the sum is 43.

The spelling of 4351231545721 in words is "four trillion, three hundred fifty-one billion, two hundred thirty-one million, five hundred forty-five thousand, seven hundred twenty-one".