1145639749 has 2 divisors, whose sum is σ = 1145639750. Its totient is φ = 1145639748.

The previous prime is 1145639687. The next prime is 1145639771. The reversal of 1145639749 is 9479365411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 786802500 + 358837249 = 28050^2 + 18943^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145639749 - 2⁹ = 1145639237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1145639779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572819874 + 572819875.

It is an arithmetic number, because the mean of its divisors is an integer number (572819875).

Almost surely, 2^1145639749 is an apocalyptic number.

It is an amenable number.

1145639749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145639749 is an equidigital number, since it uses as much as digits as its factorization.

1145639749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The square root of 1145639749 is about 33847.3004684273. The cubic root of 1145639749 is about 1046.3637632938.

The spelling of 1145639749 in words is "one billion, one hundred forty-five million, six hundred thirty-nine thousand, seven hundred forty-nine".