618971 has 2 divisors, whose sum is σ = 618972. Its totient is φ = 618970.

The previous prime is 618941. The next prime is 618979. The reversal of 618971 is 179816.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-618971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (618979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309485 + 309486.

It is an arithmetic number, because the mean of its divisors is an integer number (309486).

2⁶¹⁸⁹⁷¹ is an apocalyptic number.

618971 is a deficient number, since it is larger than the sum of its proper divisors (1).

618971 is an equidigital number, since it uses as much as digits as its factorization.

618971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 32.

The square root of 618971 is about 786.7471004077. The cubic root of 618971 is about 85.2229900415. Note that the first 3 decimals are identical.

The spelling of 618971 in words is "six hundred eighteen thousand, nine hundred seventy-one".