1295999987 has 2 divisors, whose sum is σ = 1295999988. Its totient is φ = 1295999986.

The previous prime is 1295999927. The next prime is 1296000011. The reversal of 1295999987 is 7899995921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1295999987 - 2⁶ = 1295999923 is a prime.

It is not a weakly prime, because it can be changed into another prime (1295999927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 647999993 + 647999994.

It is an arithmetic number, because the mean of its divisors is an integer number (647999994).

Almost surely, 2^1295999987 is an apocalyptic number.

1295999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1295999987 is an equidigital number, since it uses as much as digits as its factorization.

1295999987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33067440, while the sum is 68.

The square root of 1295999987 is about 35999.9998194444. Note that the first 3 decimals coincide. The cubic root of 1295999987 is about 1090.2723520538.

The spelling of 1295999987 in words is "one billion, two hundred ninety-five million, nine hundred ninety-nine thousand, nine hundred eighty-seven".