1187761213 has 2 divisors, whose sum is σ = 1187761214. Its totient is φ = 1187761212.

The previous prime is 1187761199. The next prime is 1187761229. The reversal of 1187761213 is 3121677811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1187629444 + 131769 = 34462^2 + 363^2 .

It is a cyclic number.

It is not a de Polignac number, because 1187761213 - 2⁹ = 1187760701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1187761243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593880606 + 593880607.

It is an arithmetic number, because the mean of its divisors is an integer number (593880607).

Almost surely, 2^1187761213 is an apocalyptic number.

It is an amenable number.

1187761213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187761213 is an equidigital number, since it uses as much as digits as its factorization.

1187761213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 37.

The square root of 1187761213 is about 34463.9117483782. The cubic root of 1187761213 is about 1059.0335361386.

The spelling of 1187761213 in words is "one billion, one hundred eighty-seven million, seven hundred sixty-one thousand, two hundred thirteen".