1971996071 has 4 divisors (see below), whose sum is σ = 1972226712. Its totient is φ = 1971765432.

The previous prime is 1971996043. The next prime is 1971996101. The reversal of 1971996071 is 1706991791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1706991791 = 563 ⋅3031957.

It is a cyclic number.

It is not a de Polignac number, because 1971996071 - 2⁶ = 1971996007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971996371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101981 + ... + 119766.

It is an arithmetic number, because the mean of its divisors is an integer number (493056678).

Almost surely, 2^1971996071 is an apocalyptic number.

1971996071 is a deficient number, since it is larger than the sum of its proper divisors (230641).

1971996071 is an equidigital number, since it uses as much as digits as its factorization.

1971996071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230640.

The product of its (nonzero) digits is 214326, while the sum is 50.

The square root of 1971996071 is about 44407.1623840119. The cubic root of 1971996071 is about 1254.0129317965.

The spelling of 1971996071 in words is "one billion, nine hundred seventy-one million, nine hundred ninety-six thousand, seventy-one".