1287517457381 has 8 divisors (see below), whose sum is σ = 1297326156000. Its totient is φ = 1277743728240.

The previous prime is 1287517457377. The next prime is 1287517457453. The reversal of 1287517457381 is 1837547157821.

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 1287517457381 - 2² = 1287517457377 is a prime.

It is a super-2 number, since 2×1287517457381² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1287517457381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287517457311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8668451 + ... + 8815728.

It is an arithmetic number, because the mean of its divisors is an integer number (162165769500).

Almost surely, 2^{1287517457381} is an apocalyptic number.

It is an amenable number.

1287517457381 is a deficient number, since it is larger than the sum of its proper divisors (9808698619).

1287517457381 is a wasteful number, since it uses less digits than its factorization.

1287517457381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17484739.

The product of its digits is 13171200, while the sum is 59.

The spelling of 1287517457381 in words is "one trillion, two hundred eighty-seven billion, five hundred seventeen million, four hundred fifty-seven thousand, three hundred eighty-one".