1281515250345 has 32 divisors (see below), whose sum is σ = 2236878336384. Its totient is φ = 621326361600.

The previous prime is 1281515250341. The next prime is 1281515250377. The reversal of 1281515250345 is 5430525151821.

It is not a de Polignac number, because 1281515250345 - 2² = 1281515250341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1281515250297 and 1281515250306.

It is not an unprimeable number, because it can be changed into a prime (1281515250341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11927665 + ... + 12034625.

It is an arithmetic number, because the mean of its divisors is an integer number (69902448012).

Almost surely, 2^{1281515250345} is an apocalyptic number.

1281515250345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1281515250345 is a deficient number, since it is larger than the sum of its proper divisors (955363086039).

1281515250345 is a wasteful number, since it uses less digits than its factorization.

1281515250345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179593.

The product of its (nonzero) digits is 240000, while the sum is 42.

The spelling of 1281515250345 in words is "one trillion, two hundred eighty-one billion, five hundred fifteen million, two hundred fifty thousand, three hundred forty-five".