1185897997 has 2 divisors, whose sum is σ = 1185897998. Its totient is φ = 1185897996.

The previous prime is 1185897991. The next prime is 1185898037. The reversal of 1185897997 is 7997985811.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 967272201 + 218625796 = 31101^2 + 14786^2 .

It is a cyclic number.

It is not a de Polignac number, because 1185897997 - 2¹⁵ = 1185865229 is a prime.

It is a super-2 number, since 2×1185897997² = 2812708118577224018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1185897991) 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, 592948998 + 592948999.

It is an arithmetic number, because the mean of its divisors is an integer number (592948999).

Almost surely, 2^1185897997 is an apocalyptic number.

It is an amenable number.

1185897997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1185897997 is an equidigital number, since it uses as much as digits as its factorization.

1185897997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11430720, while the sum is 64.

The square root of 1185897997 is about 34436.8697328895. The cubic root of 1185897997 is about 1058.4794851267.

The spelling of 1185897997 in words is "one billion, one hundred eighty-five million, eight hundred ninety-seven thousand, nine hundred ninety-seven".