1172026013 has 4 divisors (see below), whose sum is σ = 1172096508. Its totient is φ = 1171955520.

The previous prime is 1172026003. The next prime is 1172026027. The reversal of 1172026013 is 3106202711.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3106202711 = 4243 ⋅732077.

It can be written as a sum of positive squares in 2 ways, for example, as 524730649 + 647295364 = 22907^2 + 25442^2 .

It is a cyclic number.

It is not a de Polignac number, because 1172026013 - 2⁴ = 1172025997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1172026013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1172026003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5045 + ... + 48677.

It is an arithmetic number, because the mean of its divisors is an integer number (293024127).

Almost surely, 2^1172026013 is an apocalyptic number.

It is an amenable number.

1172026013 is a deficient number, since it is larger than the sum of its proper divisors (70495).

1172026013 is an equidigital number, since it uses as much as digits as its factorization.

1172026013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70494.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 1172026013 is about 34234.8654590609. The cubic root of 1172026013 is about 1054.3361165432.

Adding to 1172026013 its reverse (3106202711), we get a palindrome (4278228724).

The spelling of 1172026013 in words is "one billion, one hundred seventy-two million, twenty-six thousand, thirteen".