1211980039 has 2 divisors, whose sum is σ = 1211980040. Its totient is φ = 1211980038.

The previous prime is 1211980019. The next prime is 1211980073. The reversal of 1211980039 is 9300891121.

It is an a-pointer prime, because the next prime (1211980073) can be obtained adding 1211980039 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211980039 - 2¹³ = 1211971847 is a prime.

It is a super-2 number, since 2×1211980039² = 2937791229868883042, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211979986 and 1211980013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211980019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605990019 + 605990020.

It is an arithmetic number, because the mean of its divisors is an integer number (605990020).

Almost surely, 2^1211980039 is an apocalyptic number.

1211980039 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211980039 is an equidigital number, since it uses as much as digits as its factorization.

1211980039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1211980039 is about 34813.5036875061. The cubic root of 1211980039 is about 1066.1831690357.

The spelling of 1211980039 in words is "one billion, two hundred eleven million, nine hundred eighty thousand, thirty-nine".