1005551011 has 8 divisors (see below), whose sum is σ = 1017308160. Its totient is φ = 993837768.

The previous prime is 1005551009. The next prime is 1005551021. The reversal of 1005551011 is 1101555001.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1005551011 - 2¹ = 1005551009 is a prime.

It is a super-2 number, since 2×1005551011² = 2022265671446244242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1005551011.

It is not an unprimeable number, because it can be changed into a prime (1005551021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36270 + ... + 57676.

It is an arithmetic number, because the mean of its divisors is an integer number (127163520).

Almost surely, 2^1005551011 is an apocalyptic number.

1005551011 is a deficient number, since it is larger than the sum of its proper divisors (11757149).

1005551011 is a wasteful number, since it uses less digits than its factorization.

1005551011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21953.

The product of its (nonzero) digits is 125, while the sum is 19.

The square root of 1005551011 is about 31710.4243270253. The cubic root of 1005551011 is about 1001.8469237725.

The spelling of 1005551011 in words is "one billion, five million, five hundred fifty-one thousand, eleven".