945981013 has 2 divisors, whose sum is σ = 945981014. Its totient is φ = 945981012.

The previous prime is 945981011. The next prime is 945981017. The reversal of 945981013 is 310189549.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 726733764 + 219247249 = 26958^2 + 14807^2 .

It is a cyclic number.

It is not a de Polignac number, because 945981013 - 2¹ = 945981011 is a prime.

Together with 945981011, it forms a pair of twin primes.

It is equal to p_48236890 and since 945981013 and 48236890 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (945981011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 472990506 + 472990507.

It is an arithmetic number, because the mean of its divisors is an integer number (472990507).

Almost surely, 2^945981013 is an apocalyptic number.

It is an amenable number.

945981013 is a deficient number, since it is larger than the sum of its proper divisors (1).

945981013 is an equidigital number, since it uses as much as digits as its factorization.

945981013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 945981013 is about 30756.8043366017. The cubic root of 945981013 is about 981.6593479558.

The spelling of 945981013 in words is "nine hundred forty-five million, nine hundred eighty-one thousand, thirteen".