618531971 has 4 divisors (see below), whose sum is σ = 618695952. Its totient is φ = 618367992.

The previous prime is 618531931. The next prime is 618532003. The reversal of 618531971 is 179135816.

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 618531971 - 2¹⁴ = 618515587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (618531911) 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, 76196 + ... + 83921.

It is an arithmetic number, because the mean of its divisors is an integer number (154673988).

Almost surely, 2^618531971 is an apocalyptic number.

618531971 is a deficient number, since it is larger than the sum of its proper divisors (163981).

618531971 is a wasteful number, since it uses less digits than its factorization.

618531971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163980.

The product of its digits is 45360, while the sum is 41.

The square root of 618531971 is about 24870.3029937313. The cubic root of 618531971 is about 852.0283604738.

The spelling of 618531971 in words is "six hundred eighteen million, five hundred thirty-one thousand, nine hundred seventy-one".