1156204009 has 9 divisors (see below), whose sum is σ = 1189591767. Its totient is φ = 1123731144.

The previous prime is 1156204001. The next prime is 1156204039. The reversal of 1156204009 is 9004026511.

The square root of 1156204009 is 34003.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1034587225 + 121616784 = 32165^2 + 11028^2 .

It is not a de Polignac number, because 1156204009 - 2³ = 1156204001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1156204001) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1257652 + ... + 1258570.

It is an arithmetic number, because the mean of its divisors is an integer number (132176863).

Almost surely, 2^1156204009 is an apocalyptic number.

1156204009 is the 34003-rd square number.

1156204009 is the 17002-nd centered octagonal number.

It is an amenable number.

1156204009 is a deficient number, since it is larger than the sum of its proper divisors (33387758).

1156204009 is an frugal number, since it uses more digits than its factorization.

1156204009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1912 (or 956 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The cubic root of 1156204009 is about 1049.5701971817.

The spelling of 1156204009 in words is "one billion, one hundred fifty-six million, two hundred four thousand, nine".