1971147131 has 4 divisors (see below), whose sum is σ = 1981153152. Its totient is φ = 1961141112.

The previous prime is 1971147103. The next prime is 1971147149. The reversal of 1971147131 is 1317411791.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1971147131 is a prime.

It is a super-3 number, since 3×1971147131³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1971147091 and 1971147100.

It is not an unprimeable number, because it can be changed into a prime (1971147151) 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, 5002715 + ... + 5003108.

It is an arithmetic number, because the mean of its divisors is an integer number (495288288).

Almost surely, 2^1971147131 is an apocalyptic number.

1971147131 is a deficient number, since it is larger than the sum of its proper divisors (10006021).

1971147131 is a wasteful number, since it uses less digits than its factorization.

1971147131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10006020.

The product of its digits is 5292, while the sum is 35.

The square root of 1971147131 is about 44397.6027618609. The cubic root of 1971147131 is about 1253.8329560252.

The spelling of 1971147131 in words is "one billion, nine hundred seventy-one million, one hundred forty-seven thousand, one hundred thirty-one".