1001156005 has 16 divisors (see below), whose sum is σ = 1242920448. Its totient is φ = 773352000.

The previous prime is 1001155963. The next prime is 1001156053. The reversal of 1001156005 is 5006511001.

It is not a de Polignac number, because 1001156005 - 2²³ = 992767397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64450 + ... + 78460.

It is an arithmetic number, because the mean of its divisors is an integer number (77682528).

Almost surely, 2^1001156005 is an apocalyptic number.

It is an amenable number.

1001156005 is a deficient number, since it is larger than the sum of its proper divisors (241764443).

1001156005 is a wasteful number, since it uses less digits than its factorization.

1001156005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14508.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 1001156005 is about 31641.0493662900. The cubic root of 1001156005 is about 1000.3851866122.

Adding to 1001156005 its reverse (5006511001), we get a palindrome (6007667006).

The spelling of 1001156005 in words is "one billion, one million, one hundred fifty-six thousand, five".