1971129448 has 16 divisors (see below), whose sum is σ = 3786011460. Its totient is φ = 961526400.

The previous prime is 1971129409. The next prime is 1971129467. The reversal of 1971129448 is 8449211791.

It can be written as a sum of positive squares in 2 ways, for example, as 1680836004 + 290293444 = 40998^2 + 17038^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1971129398 and 1971129407.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3004443 + ... + 3005098.

Almost surely, 2^1971129448 is an apocalyptic number.

It is an amenable number.

1971129448 is a deficient number, since it is larger than the sum of its proper divisors (1814882012).

1971129448 is a wasteful number, since it uses less digits than its factorization.

1971129448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6009588 (or 6009584 counting only the distinct ones).

The product of its digits is 145152, while the sum is 46.

The square root of 1971129448 is about 44397.4036177793. The cubic root of 1971129448 is about 1253.8292066697.

The spelling of 1971129448 in words is "one billion, nine hundred seventy-one million, one hundred twenty-nine thousand, four hundred forty-eight".