100131539 has 4 divisors (see below), whose sum is σ = 105401640. Its totient is φ = 94861440.

The previous prime is 100131533. The next prime is 100131557. The reversal of 100131539 is 935131001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 935131001 = 7 ⋅133590143.

It is a cyclic number.

It is not a de Polignac number, because 100131539 - 2⁴ = 100131523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100131533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2635022 + ... + 2635059.

It is an arithmetic number, because the mean of its divisors is an integer number (26350410).

Almost surely, 2^100131539 is an apocalyptic number.

100131539 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

100131539 is a deficient number, since it is larger than the sum of its proper divisors (5270101).

100131539 is an equidigital number, since it uses as much as digits as its factorization.

100131539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5270100.

The product of its (nonzero) digits is 405, while the sum is 23.

The square root of 100131539 is about 10006.5747886077. The cubic root of 100131539 is about 464.3623108430.

The spelling of 100131539 in words is "one hundred million, one hundred thirty-one thousand, five hundred thirty-nine".