660121039 has 2 divisors, whose sum is σ = 660121040. Its totient is φ = 660121038.

The previous prime is 660121031. The next prime is 660121043. The reversal of 660121039 is 930121066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660121039 - 2³ = 660121031 is a prime.

It is a super-2 number, since 2×660121039² = 871519572260879042, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 660120998 and 660121016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660121031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330060519 + 330060520.

It is an arithmetic number, because the mean of its divisors is an integer number (330060520).

Almost surely, 2^660121039 is an apocalyptic number.

660121039 is a deficient number, since it is larger than the sum of its proper divisors (1).

660121039 is an equidigital number, since it uses as much as digits as its factorization.

660121039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 660121039 is about 25692.8207676775. The cubic root of 660121039 is about 870.7119899382.

The spelling of 660121039 in words is "six hundred sixty million, one hundred twenty-one thousand, thirty-nine".