1351725721 has 8 divisors (see below), whose sum is σ = 1424174400. Its totient is φ = 1279407600.

The previous prime is 1351725701. The next prime is 1351725731. The reversal of 1351725721 is 1275271531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1351725721 - 2⁵ = 1351725689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1351725701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11005 + ... + 53146.

It is an arithmetic number, because the mean of its divisors is an integer number (178021800).

Almost surely, 2^1351725721 is an apocalyptic number.

It is an amenable number.

1351725721 is a deficient number, since it is larger than the sum of its proper divisors (72448679).

1351725721 is a wasteful number, since it uses less digits than its factorization.

1351725721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65279.

The product of its digits is 14700, while the sum is 34.

The square root of 1351725721 is about 36765.8227298125. The cubic root of 1351725721 is about 1105.6801831803.

The spelling of 1351725721 in words is "one billion, three hundred fifty-one million, seven hundred twenty-five thousand, seven hundred twenty-one".