1097928261 has 6 divisors (see below), whose sum is σ = 1585896390. Its totient is φ = 731952168.

The previous prime is 1097928229. The next prime is 1097928283. The reversal of 1097928261 is 1628297901.

It can be written as a sum of positive squares in only one way, i.e., 1097928225 + 36 = 33135^2 + 6^2 .

It is not a de Polignac number, because 1097928261 - 2⁵ = 1097928229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1097928061) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 60996006 + ... + 60996023.

It is an arithmetic number, because the mean of its divisors is an integer number (264316065).

Almost surely, 2^1097928261 is an apocalyptic number.

It is an amenable number.

1097928261 is a deficient number, since it is larger than the sum of its proper divisors (487968129).

1097928261 is a wasteful number, since it uses less digits than its factorization.

1097928261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121992035 (or 121992032 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 1097928261 is about 33135.0005432322. Note that the first 3 decimals coincide. The cubic root of 1097928261 is about 1031.6316430314.

The spelling of 1097928261 in words is "one billion, ninety-seven million, nine hundred twenty-eight thousand, two hundred sixty-one".