1295249887 has 4 divisors (see below), whose sum is σ = 1296157720. Its totient is φ = 1294342056.

The previous prime is 1295249869. The next prime is 1295249903. The reversal of 1295249887 is 7889425921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7889425921 = 13 ⋅606878917.

It is a cyclic number.

It is not a de Polignac number, because 1295249887 - 2¹¹ = 1295247839 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 (1295249867) 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, 451773 + ... + 454630.

It is an arithmetic number, because the mean of its divisors is an integer number (324039430).

Almost surely, 2^1295249887 is an apocalyptic number.

1295249887 is a deficient number, since it is larger than the sum of its proper divisors (907833).

1295249887 is an equidigital number, since it uses as much as digits as its factorization.

1295249887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907832.

The product of its digits is 2903040, while the sum is 55.

The square root of 1295249887 is about 35989.5802559574. The cubic root of 1295249887 is about 1090.0619685331.

The spelling of 1295249887 in words is "one billion, two hundred ninety-five million, two hundred forty-nine thousand, eight hundred eighty-seven".