1001055531 has 32 divisors (see below), whose sum is σ = 1553817600. Its totient is φ = 561468960.

The previous prime is 1001055511. The next prime is 1001055533. The reversal of 1001055531 is 1355501001.

It is not a de Polignac number, because 1001055531 - 2⁵ = 1001055499 is a prime.

It is a super-2 number, since 2×1001055531² = 2004224352291383922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1001055498 and 1001055507.

It is not an unprimeable number, because it can be changed into a prime (1001055533) 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, 295276 + ... + 298646.

It is an arithmetic number, because the mean of its divisors is an integer number (48556800).

Almost surely, 2^1001055531 is an apocalyptic number.

1001055531 is a deficient number, since it is larger than the sum of its proper divisors (552762069).

1001055531 is a wasteful number, since it uses less digits than its factorization.

1001055531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3639.

The product of its (nonzero) digits is 375, while the sum is 21.

The square root of 1001055531 is about 31639.4616104636. The cubic root of 1001055531 is about 1000.3517199452.

Adding to 1001055531 its reverse (1355501001), we get a palindrome (2356556532).

The spelling of 1001055531 in words is "one billion, one million, fifty-five thousand, five hundred thirty-one".