1531381788056 has 16 divisors (see below), whose sum is σ = 2996181759600. Its totient is φ = 732399985504.

The previous prime is 1531381788023. The next prime is 1531381788059. The reversal of 1531381788056 is 6508871831351.

It is a junction number, because it is equal to n+sod(n) for n = 1531381787992 and 1531381788010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531381788059) 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, 4161363371 + ... + 4161363738.

It is an arithmetic number, because the mean of its divisors is an integer number (187261359975).

Almost surely, 2^{1531381788056} is an apocalyptic number.

It is an amenable number.

1531381788056 is a deficient number, since it is larger than the sum of its proper divisors (1464799971544).

1531381788056 is a wasteful number, since it uses less digits than its factorization.

1531381788056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8322727138 (or 8322727134 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 56.

The spelling of 1531381788056 in words is "one trillion, five hundred thirty-one billion, three hundred eighty-one million, seven hundred eighty-eight thousand, fifty-six".