1351747723621 has 4 divisors (see below), whose sum is σ = 1364871488032. Its totient is φ = 1338623959212.

The previous prime is 1351747723619. The next prime is 1351747723631. The reversal of 1351747723621 is 1263277471531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1351747723621 - 2¹ = 1351747723619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351747723631) 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, 6561882051 + ... + 6561882256.

It is an arithmetic number, because the mean of its divisors is an integer number (341217872008).

Almost surely, 2^{1351747723621} is an apocalyptic number.

It is an amenable number.

1351747723621 is a deficient number, since it is larger than the sum of its proper divisors (13123764411).

1351747723621 is a wasteful number, since it uses less digits than its factorization.

1351747723621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13123764410.

The product of its digits is 1481760, while the sum is 49.

The spelling of 1351747723621 in words is "one trillion, three hundred fifty-one billion, seven hundred forty-seven million, seven hundred twenty-three thousand, six hundred twenty-one".