1161505001 has 2 divisors, whose sum is σ = 1161505002. Its totient is φ = 1161505000.

The previous prime is 1161504983. The next prime is 1161505027. The reversal of 1161505001 is 1005051611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 934219225 + 227285776 = 30565^2 + 15076^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161505001 - 2¹⁰ = 1161503977 is a prime.

It is not a weakly prime, because it can be changed into another prime (1161505061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580752500 + 580752501.

It is an arithmetic number, because the mean of its divisors is an integer number (580752501).

Almost surely, 2^1161505001 is an apocalyptic number.

It is an amenable number.

1161505001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161505001 is an equidigital number, since it uses as much as digits as its factorization.

1161505001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 1161505001 is about 34080.8597456109. The cubic root of 1161505001 is about 1051.1717835825.

Adding to 1161505001 its reverse (1005051611), we get a palindrome (2166556612).

The spelling of 1161505001 in words is "one billion, one hundred sixty-one million, five hundred five thousand, one".