100401531 has 8 divisors (see below), whose sum is σ = 135481920. Its totient is φ = 66127752.

The previous prime is 100401527. The next prime is 100401551. The reversal of 100401531 is 135104001.

100401531 = T₉₈ + T₉₉ + ... + T₈₄₄.

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

It is not a de Polignac number, because 100401531 - 2² = 100401527 is a prime.

It is a super-2 number, since 2×100401531² = 20160934854287922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 100401531.

It is not an unprimeable number, because it can be changed into a prime (100401551) 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, 201361 + ... + 201858.

It is an arithmetic number, because the mean of its divisors is an integer number (16935240).

Almost surely, 2^100401531 is an apocalyptic number.

100401531 is a deficient number, since it is larger than the sum of its proper divisors (35080389).

100401531 is an equidigital number, since it uses as much as digits as its factorization.

100401531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403305.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 100401531 is about 10020.0564369668. The cubic root of 100401531 is about 464.7793009797.

Adding to 100401531 its reverse (135104001), we get a palindrome (235505532).

The spelling of 100401531 in words is "one hundred million, four hundred one thousand, five hundred thirty-one".