1229999887 has 2 divisors, whose sum is σ = 1229999888. Its totient is φ = 1229999886.

The previous prime is 1229999873. The next prime is 1229999893. The reversal of 1229999887 is 7889999221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1229999887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1229999807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614999943 + 614999944.

It is an arithmetic number, because the mean of its divisors is an integer number (614999944).

Almost surely, 2^1229999887 is an apocalyptic number.

1229999887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1229999887 is an equidigital number, since it uses as much as digits as its factorization.

1229999887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11757312, while the sum is 64.

The square root of 1229999887 is about 35071.3542224990. The cubic root of 1229999887 is about 1071.4412368797.

The spelling of 1229999887 in words is "one billion, two hundred twenty-nine million, nine hundred ninety-nine thousand, eight hundred eighty-seven".