7618861 has 2 divisors, whose sum is σ = 7618862. Its totient is φ = 7618860.

The previous prime is 7618859. The next prime is 7618883. The reversal of 7618861 is 1688167.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4622500 + 2996361 = 2150^2 + 1731^2 .

It is a cyclic number.

It is not a de Polignac number, because 7618861 - 2¹ = 7618859 is a prime.

Together with 7618859, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 7618861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7618811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3809430 + 3809431.

It is an arithmetic number, because the mean of its divisors is an integer number (3809431).

Almost surely, 2^7618861 is an apocalyptic number.

It is an amenable number.

7618861 is a deficient number, since it is larger than the sum of its proper divisors (1).

7618861 is an equidigital number, since it uses as much as digits as its factorization.

7618861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 37.

The square root of 7618861 is about 2760.2284325758. The cubic root of 7618861 is about 196.7720227734.

The spelling of 7618861 in words is "seven million, six hundred eighteen thousand, eight hundred sixty-one".