1231101187 has 2 divisors, whose sum is σ = 1231101188. Its totient is φ = 1231101186.

The previous prime is 1231101167. The next prime is 1231101199. The reversal of 1231101187 is 7811011321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231101187 - 2¹¹ = 1231099139 is a prime.

It is a super-2 number, since 2×1231101187² = 3031220265265617938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1231101167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615550593 + 615550594.

It is an arithmetic number, because the mean of its divisors is an integer number (615550594).

Almost surely, 2^1231101187 is an apocalyptic number.

1231101187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231101187 is an equidigital number, since it uses as much as digits as its factorization.

1231101187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 25.

The square root of 1231101187 is about 35087.0515575191. The cubic root of 1231101187 is about 1071.7609188165.

The spelling of 1231101187 in words is "one billion, two hundred thirty-one million, one hundred one thousand, one hundred eighty-seven".