1145173691 has 2 divisors, whose sum is σ = 1145173692. Its totient is φ = 1145173690.

The previous prime is 1145173661. The next prime is 1145173699. The reversal of 1145173691 is 1963715411.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1145173691 - 2²² = 1140979387 is a prime.

It is a super-2 number, since 2×1145173691² = 2622845565117126962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1145173699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572586845 + 572586846.

It is an arithmetic number, because the mean of its divisors is an integer number (572586846).

Almost surely, 2^1145173691 is an apocalyptic number.

1145173691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145173691 is an equidigital number, since it uses as much as digits as its factorization.

1145173691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 38.

The square root of 1145173691 is about 33840.4150536012. The cubic root of 1145173691 is about 1046.2218535450.

The spelling of 1145173691 in words is "one billion, one hundred forty-five million, one hundred seventy-three thousand, six hundred ninety-one".