1978030081 has 2 divisors, whose sum is σ = 1978030082. Its totient is φ = 1978030080.

The previous prime is 1978030069. The next prime is 1978030091. The reversal of 1978030081 is 1800308791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1975002481 + 3027600 = 44441^2 + 1740^2 .

It is an emirp because it is prime and its reverse (1800308791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1978030081 - 2⁵ = 1978030049 is a prime.

It is a super-2 number, since 2×1978030081² = 7825206002681733122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1978030081.

It is not a weakly prime, because it can be changed into another prime (1978030001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989015040 + 989015041.

It is an arithmetic number, because the mean of its divisors is an integer number (989015041).

Almost surely, 2^1978030081 is an apocalyptic number.

It is an amenable number.

1978030081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978030081 is an equidigital number, since it uses as much as digits as its factorization.

1978030081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 1978030081 is about 44475.0500955311. The cubic root of 1978030081 is about 1255.2906594916.

The spelling of 1978030081 in words is "one billion, nine hundred seventy-eight million, thirty thousand, eighty-one".