1287481658 has 4 divisors (see below), whose sum is σ = 1931222490. Its totient is φ = 643740828.

The previous prime is 1287481639. The next prime is 1287481661. The reversal of 1287481658 is 8561847821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8561847821 = 61 ⋅140358161.

It can be written as a sum of positive squares in only one way, i.e., 674077369 + 613404289 = 25963^2 + 24767^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321870413 + ... + 321870416.

Almost surely, 2^1287481658 is an apocalyptic number.

1287481658 is a deficient number, since it is larger than the sum of its proper divisors (643740832).

1287481658 is an equidigital number, since it uses as much as digits as its factorization.

1287481658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643740831.

The product of its digits is 860160, while the sum is 50.

The square root of 1287481658 is about 35881.4946455690. The cubic root of 1287481658 is about 1087.8783908602.

The spelling of 1287481658 in words is "one billion, two hundred eighty-seven million, four hundred eighty-one thousand, six hundred fifty-eight".