69981943 has 2 divisors, whose sum is σ = 69981944. Its totient is φ = 69981942.

The previous prime is 69981907. The next prime is 69981983. The reversal of 69981943 is 34918996.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69981943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69981983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34990971 + 34990972.

It is an arithmetic number, because the mean of its divisors is an integer number (34990972).

Almost surely, 2^69981943 is an apocalyptic number.

69981943 is a deficient number, since it is larger than the sum of its proper divisors (1).

69981943 is an equidigital number, since it uses as much as digits as its factorization.

69981943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 49.

The square root of 69981943 is about 8365.5210835907. The cubic root of 69981943 is about 412.0930897673.

The spelling of 69981943 in words is "sixty-nine million, nine hundred eighty-one thousand, nine hundred forty-three".