1287886157 has 2 divisors, whose sum is σ = 1287886158. Its totient is φ = 1287886156.

The previous prime is 1287886099. The next prime is 1287886181. The reversal of 1287886157 is 7516887821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 913308841 + 374577316 = 30221^2 + 19354^2 .

It is an emirp because it is prime and its reverse (7516887821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1287886157 - 2¹⁶ = 1287820621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1287886099 and 1287886108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287886757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643943078 + 643943079.

It is an arithmetic number, because the mean of its divisors is an integer number (643943079).

Almost surely, 2^1287886157 is an apocalyptic number.

It is an amenable number.

1287886157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287886157 is an equidigital number, since it uses as much as digits as its factorization.

1287886157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1505280, while the sum is 53.

The square root of 1287886157 is about 35887.1307992155. The cubic root of 1287886157 is about 1087.9923082488.

The spelling of 1287886157 in words is "one billion, two hundred eighty-seven million, eight hundred eighty-six thousand, one hundred fifty-seven".