1287902338261 has 48 divisors (see below), whose sum is σ = 1647508972032. Its totient is φ = 995523631200.

The previous prime is 1287902338243. The next prime is 1287902338271. The reversal of 1287902338261 is 1628332097821.

It is a happy number.

It is not a de Polignac number, because 1287902338261 - 2¹⁹ = 1287901813973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1287902338199 and 1287902338208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287902338231) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34896360 + ... + 34933246.

It is an arithmetic number, because the mean of its divisors is an integer number (34323103584).

Almost surely, 2^{1287902338261} is an apocalyptic number.

1287902338261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1287902338261 is a deficient number, since it is larger than the sum of its proper divisors (359606633771).

1287902338261 is a wasteful number, since it uses less digits than its factorization.

1287902338261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37430 (or 37423 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 1287902338261 in words is "one trillion, two hundred eighty-seven billion, nine hundred two million, three hundred thirty-eight thousand, two hundred sixty-one".