1000261161 has 12 divisors (see below), whose sum is σ = 1469310960. Its totient is φ = 655538040.

The previous prime is 1000261151. The next prime is 1000261169. The reversal of 1000261161 is 1611620001.

It is not a de Polignac number, because 1000261161 - 2¹³ = 1000252969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1000261169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 941335 + ... + 942396.

It is an arithmetic number, because the mean of its divisors is an integer number (122442580).

Almost surely, 2^1000261161 is an apocalyptic number.

It is an amenable number.

1000261161 is a deficient number, since it is larger than the sum of its proper divisors (469049799).

1000261161 is a wasteful number, since it uses less digits than its factorization.

1000261161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883796 (or 1883793 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1000261161 is about 31626.9056500948. The cubic root of 1000261161 is about 1000.0870460894.

Adding to 1000261161 its reverse (1611620001), we get a palindrome (2611881162).

The spelling of 1000261161 in words is "one billion, two hundred sixty-one thousand, one hundred sixty-one".