1097331921 has 48 divisors (see below), whose sum is σ = 1935172800. Its totient is φ = 612432576.

The previous prime is 1097331919. The next prime is 1097331923. The reversal of 1097331921 is 1291337901.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1097331919) and next prime (1097331923).

It is not a de Polignac number, because 1097331921 - 2¹ = 1097331919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1097331923) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 47245 + ... + 66533.

It is an arithmetic number, because the mean of its divisors is an integer number (40316100).

Almost surely, 2^1097331921 is an apocalyptic number.

It is an amenable number.

1097331921 is a deficient number, since it is larger than the sum of its proper divisors (837840879).

1097331921 is a wasteful number, since it uses less digits than its factorization.

1097331921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19355 (or 19342 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 1097331921 is about 33126.0006792248. Note that the first 3 decimals coincide. The cubic root of 1097331921 is about 1031.4448322132. Note that the first 3 decimals are identical.

The spelling of 1097331921 in words is "one billion, ninety-seven million, three hundred thirty-one thousand, nine hundred twenty-one".