135065197931 has 4 divisors (see below), whose sum is σ = 143010209592. Its totient is φ = 127120186272.

The previous prime is 135065197921. The next prime is 135065197957. The reversal of 135065197931 is 139791560531.

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

It is not a de Polignac number, because 135065197931 - 2⁶ = 135065197867 is a prime.

It is a super-2 number, since 2×135065197931² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135065197931.

It is not an unprimeable number, because it can be changed into a prime (135065197921) 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, 3972505805 + ... + 3972505838.

It is an arithmetic number, because the mean of its divisors is an integer number (35752552398).

Almost surely, 2^135065197931 is an apocalyptic number.

135065197931 is a deficient number, since it is larger than the sum of its proper divisors (7945011661).

135065197931 is an equidigital number, since it uses as much as digits as its factorization.

135065197931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7945011660.

The product of its (nonzero) digits is 765450, while the sum is 50.

The spelling of 135065197931 in words is "one hundred thirty-five billion, sixty-five million, one hundred ninety-seven thousand, nine hundred thirty-one".