1145292781 has 2 divisors, whose sum is σ = 1145292782. Its totient is φ = 1145292780.

The previous prime is 1145292779. The next prime is 1145292791. The reversal of 1145292781 is 1872925411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 850655556 + 294637225 = 29166^2 + 17165^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145292781 - 2¹ = 1145292779 is a prime.

It is a super-2 number, since 2×1145292781² = 2623391108421427922, which contains 22 as substring.

Together with 1145292779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1145292721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572646390 + 572646391.

It is an arithmetic number, because the mean of its divisors is an integer number (572646391).

Almost surely, 2^1145292781 is an apocalyptic number.

It is an amenable number.

1145292781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145292781 is an equidigital number, since it uses as much as digits as its factorization.

1145292781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 40.

The square root of 1145292781 is about 33842.1745902949. The cubic root of 1145292781 is about 1046.2581188565.

The spelling of 1145292781 in words is "one billion, one hundred forty-five million, two hundred ninety-two thousand, seven hundred eighty-one".