1187197667 has 2 divisors, whose sum is σ = 1187197668. Its totient is φ = 1187197666.

The previous prime is 1187197663. The next prime is 1187197727. The reversal of 1187197667 is 7667917811.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1187197667 - 2² = 1187197663 is a prime.

It is not a weakly prime, because it can be changed into another prime (1187197663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593598833 + 593598834.

It is an arithmetic number, because the mean of its divisors is an integer number (593598834).

Almost surely, 2^1187197667 is an apocalyptic number.

1187197667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187197667 is an equidigital number, since it uses as much as digits as its factorization.

1187197667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 889056, while the sum is 53.

The square root of 1187197667 is about 34455.7348927577. The cubic root of 1187197667 is about 1058.8660197165.

The spelling of 1187197667 in words is "one billion, one hundred eighty-seven million, one hundred ninety-seven thousand, six hundred sixty-seven".