618947871 has 16 divisors (see below), whose sum is σ = 861849600. Its totient is φ = 394368480.

The previous prime is 618947867. The next prime is 618947881. The reversal of 618947871 is 178749816.

618947871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 618947871 - 2² = 618947867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618947831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103986 + ... + 109776.

It is an arithmetic number, because the mean of its divisors is an integer number (53865600).

Almost surely, 2^618947871 is an apocalyptic number.

618947871 is a deficient number, since it is larger than the sum of its proper divisors (242901729).

618947871 is a wasteful number, since it uses less digits than its factorization.

618947871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7366.

The product of its digits is 677376, while the sum is 51.

The square root of 618947871 is about 24878.6629664860. The cubic root of 618947871 is about 852.2192852322.

The spelling of 618947871 in words is "six hundred eighteen million, nine hundred forty-seven thousand, eight hundred seventy-one".