1287950623 has 2 divisors, whose sum is σ = 1287950624. Its totient is φ = 1287950622.

The previous prime is 1287950621. The next prime is 1287950641. The reversal of 1287950623 is 3260597821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1287950623 - 2¹ = 1287950621 is a prime.

Together with 1287950621, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1287950623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287950621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643975311 + 643975312.

It is an arithmetic number, because the mean of its divisors is an integer number (643975312).

Almost surely, 2^1287950623 is an apocalyptic number.

1287950623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287950623 is an equidigital number, since it uses as much as digits as its factorization.

1287950623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 1287950623 is about 35888.0289651020. The cubic root of 1287950623 is about 1088.0104613393.

The spelling of 1287950623 in words is "one billion, two hundred eighty-seven million, nine hundred fifty thousand, six hundred twenty-three".