1071205091 has 16 divisors (see below), whose sum is σ = 1184675328. Its totient is φ = 960492000.

The previous prime is 1071205063. The next prime is 1071205097. The reversal of 1071205091 is 1905021701.

It is a cyclic number.

It is not a de Polignac number, because 1071205091 - 2¹⁰ = 1071204067 is a prime.

It is a super-2 number, since 2×1071205091² = 2294960693968636562, which contains 22 as substring.

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 1071205091.

It is not an unprimeable number, because it can be changed into a prime (1071205097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312710 + ... + 316116.

It is an arithmetic number, because the mean of its divisors is an integer number (74042208).

Almost surely, 2^1071205091 is an apocalyptic number.

1071205091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1071205091 is a deficient number, since it is larger than the sum of its proper divisors (113470237).

1071205091 is a wasteful number, since it uses less digits than its factorization.

1071205091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3802.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 1071205091 is about 32729.2696374362. The cubic root of 1071205091 is about 1023.1929584130.

Adding to 1071205091 its reverse (1905021701), we get a palindrome (2976226792).

It can be divided in two parts, 107120 and 5091, that added together give a palindrome (112211).

The spelling of 1071205091 in words is "one billion, seventy-one million, two hundred five thousand, ninety-one".