1353920720731 has 4 divisors (see below), whose sum is σ = 1354975999272. Its totient is φ = 1352865442192.

The previous prime is 1353920720671. The next prime is 1353920720749. The reversal of 1353920720731 is 1370270293531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1353920720731 is a prime.

It is a super-2 number, since 2×1353920720731² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1353920780731) 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, 527637346 + ... + 527639911.

It is an arithmetic number, because the mean of its divisors is an integer number (338743999818).

Almost surely, 2^{1353920720731} is an apocalyptic number.

1353920720731 is a deficient number, since it is larger than the sum of its proper divisors (1055278541).

1353920720731 is a wasteful number, since it uses less digits than its factorization.

1353920720731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055278540.

The product of its (nonzero) digits is 238140, while the sum is 43.

The spelling of 1353920720731 in words is "one trillion, three hundred fifty-three billion, nine hundred twenty million, seven hundred twenty thousand, seven hundred thirty-one".