1145242661 has 2 divisors, whose sum is σ = 1145242662. Its totient is φ = 1145242660.

The previous prime is 1145242649. The next prime is 1145242663. The reversal of 1145242661 is 1662425411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 757900900 + 387341761 = 27530^2 + 19681^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145242661 - 2¹⁰ = 1145241637 is a prime.

Together with 1145242663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1145242663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572621330 + 572621331.

It is an arithmetic number, because the mean of its divisors is an integer number (572621331).

Almost surely, 2^1145242661 is an apocalyptic number.

It is an amenable number.

1145242661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145242661 is an equidigital number, since it uses as much as digits as its factorization.

1145242661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 32.

The square root of 1145242661 is about 33841.4340860431. The cubic root of 1145242661 is about 1046.2428566101.

The spelling of 1145242661 in words is "one billion, one hundred forty-five million, two hundred forty-two thousand, six hundred sixty-one".