1161204389 has 4 divisors (see below), whose sum is σ = 1163245740. Its totient is φ = 1159163040.

The previous prime is 1161204367. The next prime is 1161204409. The reversal of 1161204389 is 9834021611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 382515364 + 778689025 = 19558^2 + 27905^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161204389 - 2²⁰ = 1160155813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161204349) 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, 1019822 + ... + 1020959.

It is an arithmetic number, because the mean of its divisors is an integer number (290811435).

Almost surely, 2^1161204389 is an apocalyptic number.

It is an amenable number.

1161204389 is a deficient number, since it is larger than the sum of its proper divisors (2041351).

1161204389 is an equidigital number, since it uses as much as digits as its factorization.

1161204389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041350.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1161204389 is about 34076.4491841506. The cubic root of 1161204389 is about 1051.0810902961.

The spelling of 1161204389 in words is "one billion, one hundred sixty-one million, two hundred four thousand, three hundred eighty-nine".