1971712447 has 2 divisors, whose sum is σ = 1971712448. Its totient is φ = 1971712446.

The previous prime is 1971712399. The next prime is 1971712453. The reversal of 1971712447 is 7442171791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1971712447 - 2²⁷ = 1837494719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1971712487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985856223 + 985856224.

It is an arithmetic number, because the mean of its divisors is an integer number (985856224).

Almost surely, 2^1971712447 is an apocalyptic number.

1971712447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971712447 is an equidigital number, since it uses as much as digits as its factorization.

1971712447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 43.

The square root of 1971712447 is about 44403.9688203656. The cubic root of 1971712447 is about 1253.9528090911.

The spelling of 1971712447 in words is "one billion, nine hundred seventy-one million, seven hundred twelve thousand, four hundred forty-seven".