135939507531 has 4 divisors (see below), whose sum is σ = 181252676712. Its totient is φ = 90626338352.

The previous prime is 135939507511. The next prime is 135939507541. The reversal of 135939507531 is 135705939531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 135939507531 - 2¹⁴ = 135939491147 is a prime.

It is a super-2 number, since 2×135939507531² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (135939507511) 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, 22656584586 + ... + 22656584591.

It is an arithmetic number, because the mean of its divisors is an integer number (45313169178).

Almost surely, 2^135939507531 is an apocalyptic number.

135939507531 is a deficient number, since it is larger than the sum of its proper divisors (45313169181).

135939507531 is an equidigital number, since it uses as much as digits as its factorization.

135939507531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45313169180.

The product of its (nonzero) digits is 1913625, while the sum is 51.

The spelling of 135939507531 in words is "one hundred thirty-five billion, nine hundred thirty-nine million, five hundred seven thousand, five hundred thirty-one".