611947843121 has 2 divisors, whose sum is σ = 611947843122. Its totient is φ = 611947843120.

The previous prime is 611947843097. The next prime is 611947843141. The reversal of 611947843121 is 121348749116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 398236723600 + 213711119521 = 631060^2 + 462289^2 .

It is a cyclic number.

It is not a de Polignac number, because 611947843121 - 2³⁴ = 594767973937 is a prime.

It is not a weakly prime, because it can be changed into another prime (611947843141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305973921560 + 305973921561.

It is an arithmetic number, because the mean of its divisors is an integer number (305973921561).

Almost surely, 2^611947843121 is an apocalyptic number.

It is an amenable number.

611947843121 is a deficient number, since it is larger than the sum of its proper divisors (1).

611947843121 is an equidigital number, since it uses as much as digits as its factorization.

611947843121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The spelling of 611947843121 in words is "six hundred eleven billion, nine hundred forty-seven million, eight hundred forty-three thousand, one hundred twenty-one".