1172013091 has 4 divisors (see below), whose sum is σ = 1172107384. Its totient is φ = 1171918800.

The previous prime is 1172013079. The next prime is 1172013107. The reversal of 1172013091 is 1903102711.

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: 1903102711 = 971 ⋅1959941.

It is a cyclic number.

It is not a de Polignac number, because 1172013091 - 2⁹ = 1172012579 is a prime.

It is a super-2 number, since 2×1172013091² = 2747229370950748562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1172013041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25050 + ... + 54511.

It is an arithmetic number, because the mean of its divisors is an integer number (293026846).

Almost surely, 2^1172013091 is an apocalyptic number.

1172013091 is a deficient number, since it is larger than the sum of its proper divisors (94293).

1172013091 is an equidigital number, since it uses as much as digits as its factorization.

1172013091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94292.

The product of its (nonzero) digits is 378, while the sum is 25.

The square root of 1172013091 is about 34234.6767328100. The cubic root of 1172013091 is about 1054.3322417198.

The spelling of 1172013091 in words is "one billion, one hundred seventy-two million, thirteen thousand, ninety-one".