100001531 has 16 divisors (see below), whose sum is σ = 123830784. Its totient is φ = 78793344.

The previous prime is 100001507. The next prime is 100001533. The reversal of 100001531 is 135100001.

It is not a de Polignac number, because 100001531 - 2⁶ = 100001467 is a prime.

It is a super-2 number, since 2×100001531² = 20000612404687922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (100001533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4655 + ... + 14888.

It is an arithmetic number, because the mean of its divisors is an integer number (7739424).

Almost surely, 2^100001531 is an apocalyptic number.

100001531 is a deficient number, since it is larger than the sum of its proper divisors (23829253).

100001531 is a wasteful number, since it uses less digits than its factorization.

100001531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19610.

The product of its (nonzero) digits is 15, while the sum is 11.

The square root of 100001531 is about 10000.0765497070. The cubic root of 100001531 is about 464.1612521067.

Adding to 100001531 its reverse (135100001), we get a palindrome (235101532).

The spelling of 100001531 in words is "one hundred million, one thousand, five hundred thirty-one".