1971361963 has 4 divisors (see below), whose sum is σ = 1978377768. Its totient is φ = 1964346160.

The previous prime is 1971361919. The next prime is 1971361991. The reversal of 1971361963 is 3691631791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3691631791 = 25303 ⋅145897.

It is a cyclic number.

It is not a de Polignac number, because 1971361963 - 2⁹ = 1971361451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1971361163) 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, 3507481 + ... + 3508042.

It is an arithmetic number, because the mean of its divisors is an integer number (494594442).

Almost surely, 2^1971361963 is an apocalyptic number.

1971361963 is a deficient number, since it is larger than the sum of its proper divisors (7015805).

1971361963 is an equidigital number, since it uses as much as digits as its factorization.

1971361963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7015804.

The product of its digits is 183708, while the sum is 46.

The square root of 1971361963 is about 44400.0221058504. The cubic root of 1971361963 is about 1253.8785054166.

The spelling of 1971361963 in words is "one billion, nine hundred seventy-one million, three hundred sixty-one thousand, nine hundred sixty-three".