1172642987 has 2 divisors, whose sum is σ = 1172642988. Its totient is φ = 1172642986.

The previous prime is 1172642957. The next prime is 1172642993. The reversal of 1172642987 is 7892462711.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1172642987 - 2¹⁴ = 1172626603 is a prime.

It is not a weakly prime, because it can be changed into another prime (1172642957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 586321493 + 586321494.

It is an arithmetic number, because the mean of its divisors is an integer number (586321494).

Almost surely, 2^1172642987 is an apocalyptic number.

1172642987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1172642987 is an equidigital number, since it uses as much as digits as its factorization.

1172642987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The square root of 1172642987 is about 34243.8751749857. The cubic root of 1172642987 is about 1054.5210907824.

The spelling of 1172642987 in words is "one billion, one hundred seventy-two million, six hundred forty-two thousand, nine hundred eighty-seven".