1165250013 has 4 divisors (see below), whose sum is σ = 1553666688. Its totient is φ = 776833340.

The previous prime is 1165249963. The next prime is 1165250063. The reversal of 1165250013 is 3100525611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3100525611 = 3 ⋅1033508537.

It is an interprime number because it is at equal distance from previous prime (1165249963) and next prime (1165250063).

It is a cyclic number.

It is not a de Polignac number, because 1165250013 - 2⁶ = 1165249949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165250063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194208333 + ... + 194208338.

It is an arithmetic number, because the mean of its divisors is an integer number (388416672).

Almost surely, 2^1165250013 is an apocalyptic number.

It is an amenable number.

1165250013 is a deficient number, since it is larger than the sum of its proper divisors (388416675).

1165250013 is an equidigital number, since it uses as much as digits as its factorization.

1165250013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388416674.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1165250013 is about 34135.7585678127. The cubic root of 1165250013 is about 1052.3003273121.

Adding to 1165250013 its reverse (3100525611), we get a palindrome (4265775624).

The spelling of 1165250013 in words is "one billion, one hundred sixty-five million, two hundred fifty thousand, thirteen".