1081991732 has 6 divisors (see below), whose sum is σ = 1893485538. Its totient is φ = 540995864.

The previous prime is 1081991717. The next prime is 1081991773. The reversal of 1081991732 is 2371991801.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 634838416 + 447153316 = 25196^2 + 21146^2 .

It is a super-2 number, since 2×1081991732² = 2341412216232719648, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1081991732.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135248963 + ... + 135248970.

It is an arithmetic number, because the mean of its divisors is an integer number (315580923).

Almost surely, 2^1081991732 is an apocalyptic number.

It is an amenable number.

1081991732 is a deficient number, since it is larger than the sum of its proper divisors (811493806).

1081991732 is a wasteful number, since it uses less digits than its factorization.

1081991732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270497937 (or 270497935 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 1081991732 is about 32893.6427292570. The cubic root of 1081991732 is about 1026.6158869489.

The spelling of 1081991732 in words is "one billion, eighty-one million, nine hundred ninety-one thousand, seven hundred thirty-two".