1287302641 has 3 divisors (see below), whose sum is σ = 1287338521. Its totient is φ = 1287266762.

The previous prime is 1287302623. The next prime is 1287302647. The reversal of 1287302641 is 1462037821.

The square root of 1287302641 is 35879.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1462037821 = 19 ⋅76949359.

It is not a de Polignac number, because 1287302641 - 2²¹ = 1285205489 is a prime.

It is a super-3 number, since 3×1287302641³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1287302597 and 1287302606.

It is not an unprimeable number, because it can be changed into a prime (1287302647) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 17940 + ... + 53818.

Almost surely, 2^1287302641 is an apocalyptic number.

1287302641 is the 35879-th square number.

1287302641 is the 17940-th centered octagonal number.

It is an amenable number.

1287302641 is a deficient number, since it is larger than the sum of its proper divisors (35880).

1287302641 is an frugal number, since it uses more digits than its factorization.

1287302641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71758 (or 35879 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The cubic root of 1287302641 is about 1087.8279674227.

The spelling of 1287302641 in words is "one billion, two hundred eighty-seven million, three hundred two thousand, six hundred forty-one".