1991970532 has 6 divisors (see below), whose sum is σ = 3485948438. Its totient is φ = 995985264.

The previous prime is 1991970523. The next prime is 1991970601. The reversal of 1991970532 is 2350791991.

It can be written as a sum of positive squares in only one way, i.e., 1226120256 + 765850276 = 35016^2 + 27674^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248996313 + ... + 248996320.

Almost surely, 2^1991970532 is an apocalyptic number.

It is an amenable number.

1991970532 is a deficient number, since it is larger than the sum of its proper divisors (1493977906).

1991970532 is a wasteful number, since it uses less digits than its factorization.

1991970532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497992637 (or 497992635 counting only the distinct ones).

The product of its (nonzero) digits is 153090, while the sum is 46.

The square root of 1991970532 is about 44631.4970844582. The cubic root of 1991970532 is about 1258.2327058322.

The spelling of 1991970532 in words is "one billion, nine hundred ninety-one million, nine hundred seventy thousand, five hundred thirty-two".