1001055999 has 32 divisors (see below), whose sum is σ = 1463408640. Its totient is φ = 605952000.

The previous prime is 1001055989. The next prime is 1001056087. The reversal of 1001055999 is 9995501001.

It is not a de Polignac number, because 1001055999 - 2⁵ = 1001055967 is a prime.

It is a super-2 number, since 2×1001055999² = 2004226226267776002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001055929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 633192 + ... + 634770.

It is an arithmetic number, because the mean of its divisors is an integer number (45731520).

Almost surely, 2^1001055999 is an apocalyptic number.

1001055999 is a deficient number, since it is larger than the sum of its proper divisors (462352641).

1001055999 is a wasteful number, since it uses less digits than its factorization.

1001055999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2031.

The product of its (nonzero) digits is 18225, while the sum is 39.

The square root of 1001055999 is about 31639.4690062902. The cubic root of 1001055999 is about 1000.3518758355.

The spelling of 1001055999 in words is "one billion, one million, fifty-five thousand, nine hundred ninety-nine".