131998535 has 8 divisors (see below), whose sum is σ = 159408096. Its totient is φ = 104925600.

The previous prime is 131998511. The next prime is 131998547. The reversal of 131998535 is 535899131.

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

It is not a de Polignac number, because 131998535 - 2¹⁰ = 131997511 is a prime.

It is a super-2 number, since 2×131998535² = 34847226484292450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83291 + ... + 84860.

It is an arithmetic number, because the mean of its divisors is an integer number (19926012).

Almost surely, 2^131998535 is an apocalyptic number.

131998535 is a deficient number, since it is larger than the sum of its proper divisors (27409561).

131998535 is a wasteful number, since it uses less digits than its factorization.

131998535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168313.

The product of its digits is 145800, while the sum is 44.

The square root of 131998535 is about 11489.0615369577. The cubic root of 131998535 is about 509.1624533081.

The spelling of 131998535 in words is "one hundred thirty-one million, nine hundred ninety-eight thousand, five hundred thirty-five".