100398531 has 8 divisors (see below), whose sum is σ = 134887104. Its totient is φ = 66421160.

The previous prime is 100398509. The next prime is 100398539. The reversal of 100398531 is 135893001.

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 100398531 - 2¹⁵ = 100365763 is a prime.

It is a super-2 number, since 2×100398531² = 20159730053915922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (100398539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127341 + ... + 128126.

It is an arithmetic number, because the mean of its divisors is an integer number (16860888).

Almost surely, 2^100398531 is an apocalyptic number.

100398531 is a deficient number, since it is larger than the sum of its proper divisors (34488573).

100398531 is a wasteful number, since it uses less digits than its factorization.

100398531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255601.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 100398531 is about 10019.9067360929. The cubic root of 100398531 is about 464.7746717283.

The spelling of 100398531 in words is "one hundred million, three hundred ninety-eight thousand, five hundred thirty-one".