1123957987 has 2 divisors, whose sum is σ = 1123957988. Its totient is φ = 1123957986.

The previous prime is 1123957957. The next prime is 1123958063. The reversal of 1123957987 is 7897593211.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1123957987 - 2¹¹ = 1123955939 is a prime.

It is not a weakly prime, because it can be changed into another prime (1123957927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561978993 + 561978994.

It is an arithmetic number, because the mean of its divisors is an integer number (561978994).

Almost surely, 2^1123957987 is an apocalyptic number.

1123957987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123957987 is an equidigital number, since it uses as much as digits as its factorization.

1123957987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 52.

The square root of 1123957987 is about 33525.4826512610. The cubic root of 1123957987 is about 1039.7207050185.

The spelling of 1123957987 in words is "one billion, one hundred twenty-three million, nine hundred fifty-seven thousand, nine hundred eighty-seven".