317145887 has 4 divisors (see below), whose sum is σ = 318291096. Its totient is φ = 316000680.

The previous prime is 317145869. The next prime is 317145901. The reversal of 317145887 is 788541713.

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 317145887 - 2⁶ = 317145823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (317145287) 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, 572189 + ... + 572742.

It is an arithmetic number, because the mean of its divisors is an integer number (79572774).

Almost surely, 2^317145887 is an apocalyptic number.

317145887 is a deficient number, since it is larger than the sum of its proper divisors (1145209).

317145887 is a wasteful number, since it uses less digits than its factorization.

317145887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145208.

The product of its digits is 188160, while the sum is 44.

The square root of 317145887 is about 17808.5902586364. The cubic root of 317145887 is about 681.9507758810.

The spelling of 317145887 in words is "three hundred seventeen million, one hundred forty-five thousand, eight hundred eighty-seven".