1381651546521 has 8 divisors (see below), whose sum is σ = 1842313824000. Its totient is φ = 921045150032.

The previous prime is 1381651546507. The next prime is 1381651546523. The reversal of 1381651546521 is 1256451561831.

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 1381651546521 - 2⁵ = 1381651546489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1381651546523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13912521 + ... + 14011478.

It is an arithmetic number, because the mean of its divisors is an integer number (230289228000).

Almost surely, 2^{1381651546521} is an apocalyptic number.

It is an amenable number.

1381651546521 is a deficient number, since it is larger than the sum of its proper divisors (460662277479).

1381651546521 is a wasteful number, since it uses less digits than its factorization.

1381651546521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27940495.

The product of its digits is 864000, while the sum is 48.

The spelling of 1381651546521 in words is "one trillion, three hundred eighty-one billion, six hundred fifty-one million, five hundred forty-six thousand, five hundred twenty-one".