1971616573 has 4 divisors (see below), whose sum is σ = 1971806400. Its totient is φ = 1971426748.

The previous prime is 1971616499. The next prime is 1971616597. The reversal of 1971616573 is 3756161791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1971616573 - 2⁹ = 1971616061 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 (1971616873) 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, 78373 + ... + 100426.

It is an arithmetic number, because the mean of its divisors is an integer number (492951600).

Almost surely, 2^1971616573 is an apocalyptic number.

It is an amenable number.

1971616573 is a deficient number, since it is larger than the sum of its proper divisors (189827).

1971616573 is a wasteful number, since it uses less digits than its factorization.

1971616573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189826.

The product of its digits is 238140, while the sum is 46.

The square root of 1971616573 is about 44402.8892415798. The cubic root of 1971616573 is about 1253.9324843863.

The spelling of 1971616573 in words is "one billion, nine hundred seventy-one million, six hundred sixteen thousand, five hundred seventy-three".