611978069 has 2 divisors, whose sum is σ = 611978070. Its totient is φ = 611978068.

The previous prime is 611978063. The next prime is 611978071. The reversal of 611978069 is 960879116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 607622500 + 4355569 = 24650^2 + 2087^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-611978069 is a prime.

It is a super-2 number, since 2×611978069² = 749034313873937522, which contains 22 as substring.

Together with 611978071, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611978063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305989034 + 305989035.

It is an arithmetic number, because the mean of its divisors is an integer number (305989035).

Almost surely, 2^611978069 is an apocalyptic number.

It is an amenable number.

611978069 is a deficient number, since it is larger than the sum of its proper divisors (1).

611978069 is an equidigital number, since it uses as much as digits as its factorization.

611978069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 611978069 is about 24738.1904956688. The cubic root of 611978069 is about 849.0083332400.

The spelling of 611978069 in words is "six hundred eleven million, nine hundred seventy-eight thousand, sixty-nine".