1231122187 has 2 divisors, whose sum is σ = 1231122188. Its totient is φ = 1231122186.

The previous prime is 1231122097. The next prime is 1231122197. The reversal of 1231122187 is 7812211321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231122187 - 2⁷ = 1231122059 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231122197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615561093 + 615561094.

It is an arithmetic number, because the mean of its divisors is an integer number (615561094).

Almost surely, 2^1231122187 is an apocalyptic number.

1231122187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231122187 is an equidigital number, since it uses as much as digits as its factorization.

1231122187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 28.

The square root of 1231122187 is about 35087.3508119379. The cubic root of 1231122187 is about 1071.7670127785.

The spelling of 1231122187 in words is "one billion, two hundred thirty-one million, one hundred twenty-two thousand, one hundred eighty-seven".