1166401387 has 2 divisors, whose sum is σ = 1166401388. Its totient is φ = 1166401386.

The previous prime is 1166401363. The next prime is 1166401391. The reversal of 1166401387 is 7831046611.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1166401387 is a prime.

It is not a weakly prime, because it can be changed into another prime (1166401307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583200693 + 583200694.

It is an arithmetic number, because the mean of its divisors is an integer number (583200694).

Almost surely, 2^1166401387 is an apocalyptic number.

1166401387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166401387 is an equidigital number, since it uses as much as digits as its factorization.

1166401387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 1166401387 is about 34152.6190357343. The cubic root of 1166401387 is about 1052.6468030006.

Adding to 1166401387 its reverse (7831046611), we get a palindrome (8997447998).

The spelling of 1166401387 in words is "one billion, one hundred sixty-six million, four hundred one thousand, three hundred eighty-seven".