1281516625487 has 24 divisors (see below), whose sum is σ = 1556264833920. Its totient is φ = 1033526701440.

The previous prime is 1281516625457. The next prime is 1281516625577. The reversal of 1281516625487 is 7845266151821.

It is a happy number.

It is not a de Polignac number, because 1281516625487 - 2¹² = 1281516621391 is a prime.

It is a super-2 number, since 2×1281516625487² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281516625447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6971564 + ... + 7153022.

It is an arithmetic number, because the mean of its divisors is an integer number (64844368080).

Almost surely, 2^{1281516625487} is an apocalyptic number.

1281516625487 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1281516625487 is a deficient number, since it is larger than the sum of its proper divisors (274748208433).

1281516625487 is a wasteful number, since it uses less digits than its factorization.

1281516625487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184991 (or 184974 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 56.

The spelling of 1281516625487 in words is "one trillion, two hundred eighty-one billion, five hundred sixteen million, six hundred twenty-five thousand, four hundred eighty-seven".