2945942981 has 2 divisors, whose sum is σ = 2945942982. Its totient is φ = 2945942980.

The previous prime is 2945942977. The next prime is 2945943019. The reversal of 2945942981 is 1892495492.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1830984100 + 1114958881 = 42790^2 + 33391^2 .

It is a cyclic number.

It is not a de Polignac number, because 2945942981 - 2² = 2945942977 is a prime.

It is a super-2 number, since 2×2945942981² = 17357160094606332722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2945942911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1472971490 + 1472971491.

It is an arithmetic number, because the mean of its divisors is an integer number (1472971491).

Almost surely, 2^2945942981 is an apocalyptic number.

It is an amenable number.

2945942981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2945942981 is an equidigital number, since it uses as much as digits as its factorization.

2945942981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 53.

The square root of 2945942981 is about 54276.5417192363. The cubic root of 2945942981 is about 1433.5343777066.

The spelling of 2945942981 in words is "two billion, nine hundred forty-five million, nine hundred forty-two thousand, nine hundred eighty-one".