1287151 has 4 divisors (see below), whose sum is σ = 1328704. Its totient is φ = 1245600.

The previous prime is 1287133. The next prime is 1287157. The reversal of 1287151 is 1517821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1517821 = 83 ⋅18287.

It is a cyclic number.

It is not a de Polignac number, because 1287151 - 2¹⁷ = 1156079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20730 + ... + 20791.

It is an arithmetic number, because the mean of its divisors is an integer number (332176).

2^1287151 is an apocalyptic number.

1287151 is a deficient number, since it is larger than the sum of its proper divisors (41553).

1287151 is an equidigital number, since it uses as much as digits as its factorization.

1287151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41552.

The product of its digits is 560, while the sum is 25.

The square root of 1287151 is about 1134.5267735933. The cubic root of 1287151 is about 108.7785251283.

The spelling of 1287151 in words is "one million, two hundred eighty-seven thousand, one hundred fifty-one".