147987817 has 4 divisors (see below), whose sum is σ = 148120720. Its totient is φ = 147854916.

The previous prime is 147987809. The next prime is 147987857. The reversal of 147987817 is 718789741.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 718789741 = 19 ⋅37831039.

It is a cyclic number.

It is not a de Polignac number, because 147987817 - 2³ = 147987809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (147987857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64767 + ... + 67012.

It is an arithmetic number, because the mean of its divisors is an integer number (37030180).

Almost surely, 2^147987817 is an apocalyptic number.

It is an amenable number.

147987817 is a deficient number, since it is larger than the sum of its proper divisors (132903).

147987817 is a wasteful number, since it uses less digits than its factorization.

147987817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132902.

The product of its digits is 790272, while the sum is 52.

The square root of 147987817 is about 12165.0243320760. The cubic root of 147987817 is about 528.9427327132.

The spelling of 147987817 in words is "one hundred forty-seven million, nine hundred eighty-seven thousand, eight hundred seventeen".