1145478181 has 2 divisors, whose sum is σ = 1145478182. Its totient is φ = 1145478180.

The previous prime is 1145478167. The next prime is 1145478193. The reversal of 1145478181 is 1818745411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1139670081 + 5808100 = 33759^2 + 2410^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145478181 - 2¹⁷ = 1145347109 is a prime.

It is a super-2 number, since 2×1145478181² = 2624240526294137522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1145478781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572739090 + 572739091.

It is an arithmetic number, because the mean of its divisors is an integer number (572739091).

Almost surely, 2^1145478181 is an apocalyptic number.

It is an amenable number.

1145478181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145478181 is an equidigital number, since it uses as much as digits as its factorization.

1145478181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35840, while the sum is 40.

The square root of 1145478181 is about 33844.9136651285. The cubic root of 1145478181 is about 1046.3145718999.

The spelling of 1145478181 in words is "one billion, one hundred forty-five million, four hundred seventy-eight thousand, one hundred eighty-one".