1351721022745 has 4 divisors (see below), whose sum is σ = 1622065227300. Its totient is φ = 1081376818192.

The previous prime is 1351721022733. The next prime is 1351721022859. The reversal of 1351721022745 is 5472201271531.

It is a happy number.

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 238771981449 + 1112949041296 = 488643^2 + 1054964^2 .

It is a cyclic number.

It is not a de Polignac number, because 1351721022745 - 2⁵ = 1351721022713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1351721022698 and 1351721022707.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 135172102270 + ... + 135172102279.

It is an arithmetic number, because the mean of its divisors is an integer number (405516306825).

Almost surely, 2^{1351721022745} is an apocalyptic number.

It is an amenable number.

1351721022745 is a deficient number, since it is larger than the sum of its proper divisors (270344204555).

1351721022745 is an equidigital number, since it uses as much as digits as its factorization.

1351721022745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270344204554.

The product of its (nonzero) digits is 117600, while the sum is 40.

The spelling of 1351721022745 in words is "one trillion, three hundred fifty-one billion, seven hundred twenty-one million, twenty-two thousand, seven hundred forty-five".