611618389 has 2 divisors, whose sum is σ = 611618390. Its totient is φ = 611618388.

The previous prime is 611618387. The next prime is 611618407. The reversal of 611618389 is 983816116.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 610584100 + 1034289 = 24710^2 + 1017^2 .

It is a cyclic number.

It is not a de Polignac number, because 611618389 - 2¹ = 611618387 is a prime.

Together with 611618387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611618387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305809194 + 305809195.

It is an arithmetic number, because the mean of its divisors is an integer number (305809195).

Almost surely, 2^611618389 is an apocalyptic number.

It is an amenable number.

611618389 is a deficient number, since it is larger than the sum of its proper divisors (1).

611618389 is an equidigital number, since it uses as much as digits as its factorization.

611618389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 43.

The square root of 611618389 is about 24730.9196957978. The cubic root of 611618389 is about 848.8419704361.

The spelling of 611618389 in words is "six hundred eleven million, six hundred eighteen thousand, three hundred eighty-nine".