1971197693 has 8 divisors (see below), whose sum is σ = 2087373120. Its totient is φ = 1856265120.

The previous prime is 1971197653. The next prime is 1971197699. The reversal of 1971197693 is 3967911791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1971197693 - 2¹⁶ = 1971132157 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 (1971197699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307448 + ... + 313793.

It is an arithmetic number, because the mean of its divisors is an integer number (260921640).

Almost surely, 2^1971197693 is an apocalyptic number.

It is an amenable number.

1971197693 is a deficient number, since it is larger than the sum of its proper divisors (116175427).

1971197693 is a wasteful number, since it uses less digits than its factorization.

1971197693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621427.

The product of its digits is 642978, while the sum is 53.

The square root of 1971197693 is about 44398.1721808455. The cubic root of 1971197693 is about 1253.8436766455.

The spelling of 1971197693 in words is "one billion, nine hundred seventy-one million, one hundred ninety-seven thousand, six hundred ninety-three".