171312154939 has 4 divisors (see below), whose sum is σ = 172913203224. Its totient is φ = 169711106656.

The previous prime is 171312154931. The next prime is 171312154967. The reversal of 171312154939 is 939451213171.

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 171312154939 - 2³ = 171312154931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171312154931) 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, 800523982 + ... + 800524195.

It is an arithmetic number, because the mean of its divisors is an integer number (43228300806).

Almost surely, 2^171312154939 is an apocalyptic number.

171312154939 is a deficient number, since it is larger than the sum of its proper divisors (1601048285).

171312154939 is a wasteful number, since it uses less digits than its factorization.

171312154939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601048284.

The product of its digits is 204120, while the sum is 46.

The spelling of 171312154939 in words is "one hundred seventy-one billion, three hundred twelve million, one hundred fifty-four thousand, nine hundred thirty-nine".