19441691947 has 2 divisors, whose sum is σ = 19441691948. Its totient is φ = 19441691946.

The previous prime is 19441691909. The next prime is 19441691957. The reversal of 19441691947 is 74919614491.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19441691947 - 2¹⁵ = 19441659179 is a prime.

It is not a weakly prime, because it can be changed into another prime (19441691957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9720845973 + 9720845974.

It is an arithmetic number, because the mean of its divisors is an integer number (9720845974).

Almost surely, 2^19441691947 is an apocalyptic number.

19441691947 is a deficient number, since it is larger than the sum of its proper divisors (1).

19441691947 is an equidigital number, since it uses as much as digits as its factorization.

19441691947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 55.

The spelling of 19441691947 in words is "nineteen billion, four hundred forty-one million, six hundred ninety-one thousand, nine hundred forty-seven".