1205006981 has 2 divisors, whose sum is σ = 1205006982. Its totient is φ = 1205006980.

The previous prime is 1205006977. The next prime is 1205007019. The reversal of 1205006981 is 1896005021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1015696900 + 189310081 = 31870^2 + 13759^2 .

It is an emirp because it is prime and its reverse (1896005021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1205006981 - 2² = 1205006977 is a prime.

It is a super-2 number, since 2×1205006981² = 2904083648517468722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205006911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602503490 + 602503491.

It is an arithmetic number, because the mean of its divisors is an integer number (602503491).

Almost surely, 2^1205006981 is an apocalyptic number.

It is an amenable number.

1205006981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205006981 is an equidigital number, since it uses as much as digits as its factorization.

1205006981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 1205006981 is about 34713.2104680624. The cubic root of 1205006981 is about 1064.1344936763.

The spelling of 1205006981 in words is "one billion, two hundred five million, six thousand, nine hundred eighty-one".