1001161505 has 4 divisors (see below), whose sum is σ = 1201393812. Its totient is φ = 800929200.

The previous prime is 1001161489. The next prime is 1001161507. The reversal of 1001161505 is 5051611001.

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 795296401 + 205865104 = 28201^2 + 14348^2 .

It is not a de Polignac number, because 1001161505 - 2⁴ = 1001161489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001161507) 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, 100116146 + ... + 100116155.

It is an arithmetic number, because the mean of its divisors is an integer number (300348453).

Almost surely, 2^1001161505 is an apocalyptic number.

It is an amenable number.

1001161505 is a deficient number, since it is larger than the sum of its proper divisors (200232307).

1001161505 is an equidigital number, since it uses as much as digits as its factorization.

1001161505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200232306.

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

The square root of 1001161505 is about 31641.1362785852. The cubic root of 1001161505 is about 1000.3870185307.

Adding to 1001161505 its reverse (5051611001), we get a palindrome (6052772506).

The spelling of 1001161505 in words is "one billion, one million, one hundred sixty-one thousand, five hundred five".