1287342801 has 24 divisors (see below), whose sum is σ = 1942289440. Its totient is φ = 852031872.

The previous prime is 1287342779. The next prime is 1287342817. The reversal of 1287342801 is 1082437821.

1287342801 = 2974² + 2975² + ... + 3112².

1287342801 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-1287342801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287343801) 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, 14721 + ... + 52833.

Almost surely, 2^1287342801 is an apocalyptic number.

It is an amenable number.

1287342801 is a deficient number, since it is larger than the sum of its proper divisors (654946639).

1287342801 is an equidigital number, since it uses as much as digits as its factorization.

1287342801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38267 (or 38255 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 1287342801 is about 35879.5596544885. The cubic root of 1287342801 is about 1087.8392796336.

The spelling of 1287342801 in words is "one billion, two hundred eighty-seven million, three hundred forty-two thousand, eight hundred one".