1097921572 has 54 divisors (see below), whose sum is σ = 2171842386. Its totient is φ = 485274240.

The previous prime is 1097921519. The next prime is 1097921579. The reversal of 1097921572 is 2751297901.

It can be written as a sum of positive squares in 3 ways, for example, as 515471616 + 582449956 = 22704^2 + 24134^2 .

It is not an unprimeable number, because it can be changed into a prime (1097921579) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 661768 + ... + 663424.

Almost surely, 2^1097921572 is an apocalyptic number.

It is an amenable number.

1097921572 is a deficient number, since it is larger than the sum of its proper divisors (1073920814).

1097921572 is a wasteful number, since it uses less digits than its factorization.

1097921572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1757 (or 1707 counting only the distinct ones).

The product of its (nonzero) digits is 79380, while the sum is 43.

The square root of 1097921572 is about 33134.8996075135. The cubic root of 1097921572 is about 1031.6295479952.

The spelling of 1097921572 in words is "one billion, ninety-seven million, nine hundred twenty-one thousand, five hundred seventy-two".