1971731146 has 16 divisors (see below), whose sum is σ = 3687393600. Its totient is φ = 768206880.

The previous prime is 1971731107. The next prime is 1971731149. The reversal of 1971731146 is 6411371791.

It is a junction number, because it is equal to n+sod(n) for n = 1971731099 and 1971731108.

It is not an unprimeable number, because it can be changed into a prime (1971731149) 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, 6401571 + ... + 6401878.

It is an arithmetic number, because the mean of its divisors is an integer number (230462100).

Almost surely, 2^1971731146 is an apocalyptic number.

1971731146 is a deficient number, since it is larger than the sum of its proper divisors (1715662454).

1971731146 is a wasteful number, since it uses less digits than its factorization.

1971731146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12803469.

The product of its digits is 31752, while the sum is 40.

The square root of 1971731146 is about 44404.1793753696. The cubic root of 1971731146 is about 1253.9567730886.

The spelling of 1971731146 in words is "one billion, nine hundred seventy-one million, seven hundred thirty-one thousand, one hundred forty-six".