1971205071 has 12 divisors (see below), whose sum is σ = 2888929176. Its totient is φ = 1194669520.

The previous prime is 1971205069. The next prime is 1971205127. The reversal of 1971205071 is 1705021791.

It is not a de Polignac number, because 1971205071 - 2¹ = 1971205069 is a prime.

It is a super-2 number, since 2×1971205071² = 7771298863872230082, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971205031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2714796 + ... + 2715521.

It is an arithmetic number, because the mean of its divisors is an integer number (240744098).

Almost surely, 2^1971205071 is an apocalyptic number.

1971205071 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1971205071 is a deficient number, since it is larger than the sum of its proper divisors (917724105).

1971205071 is a wasteful number, since it uses less digits than its factorization.

1971205071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5430342 (or 5430331 counting only the distinct ones).

The product of its (nonzero) digits is 4410, while the sum is 33.

The square root of 1971205071 is about 44398.2552697738. The cubic root of 1971205071 is about 1253.8452409816.

The spelling of 1971205071 in words is "one billion, nine hundred seventy-one million, two hundred five thousand, seventy-one".