19529971 has 2 divisors, whose sum is σ = 19529972. Its totient is φ = 19529970.

The previous prime is 19529953. The next prime is 19529977. The reversal of 19529971 is 17992591.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19529971 is a prime.

It is not a weakly prime, because it can be changed into another prime (19529977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9764985 + 9764986.

It is an arithmetic number, because the mean of its divisors is an integer number (9764986).

Almost surely, 2^19529971 is an apocalyptic number.

19529971 is a deficient number, since it is larger than the sum of its proper divisors (1).

19529971 is an equidigital number, since it uses as much as digits as its factorization.

19529971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51030, while the sum is 43.

The square root of 19529971 is about 4419.2726777152. The cubic root of 19529971 is about 269.2984576788.

The spelling of 19529971 in words is "nineteen million, five hundred twenty-nine thousand, nine hundred seventy-one".