1213101187 has 2 divisors, whose sum is σ = 1213101188. Its totient is φ = 1213101186.

The previous prime is 1213101173. The next prime is 1213101209. The reversal of 1213101187 is 7811013121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213101187 is a prime.

It is a super-2 number, since 2×1213101187² = 2943228979801617938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1213101157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606550593 + 606550594.

It is an arithmetic number, because the mean of its divisors is an integer number (606550594).

Almost surely, 2^1213101187 is an apocalyptic number.

1213101187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213101187 is an equidigital number, since it uses as much as digits as its factorization.

1213101187 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1213101187 is about 34829.6021653995. The cubic root of 1213101187 is about 1066.5118270142.

It can be divided in two parts, 1213 and 101187, that added together give a square (102400 = 320²).

The spelling of 1213101187 in words is "one billion, two hundred thirteen million, one hundred one thousand, one hundred eighty-seven".