1091212972 has 24 divisors (see below), whose sum is σ = 1948783536. Its totient is φ = 534451008.

The previous prime is 1091212961. The next prime is 1091212999. The reversal of 1091212972 is 2792121901.

It is a happy number.

It is a super-2 number, since 2×1091212972² = 2381491500522145568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139723 + ... + 147325.

It is an arithmetic number, because the mean of its divisors is an integer number (81199314).

Almost surely, 2^1091212972 is an apocalyptic number.

It is an amenable number.

1091212972 is a deficient number, since it is larger than the sum of its proper divisors (857570564).

1091212972 is a wasteful number, since it uses less digits than its factorization.

1091212972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8337 (or 8335 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 1091212972 is about 33033.5128619407. The cubic root of 1091212972 is about 1029.5240745931.

The spelling of 1091212972 in words is "one billion, ninety-one million, two hundred twelve thousand, nine hundred seventy-two".