1097398129 has 9 divisors (see below), whose sum is σ = 1109691531. Its totient is φ = 1085240520.

The previous prime is 1097398121. The next prime is 1097398139. The reversal of 1097398129 is 9218937901.

The square root of 1097398129 is 33127.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 321664225 + 775733904 = 17935^2 + 27852^2 .

It is not a de Polignac number, because 1097398129 - 2³ = 1097398121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1097398121) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5200834 + ... + 5201044.

It is an arithmetic number, because the mean of its divisors is an integer number (123299059).

Almost surely, 2^1097398129 is an apocalyptic number.

1097398129 is the 33127-th square number.

1097398129 is the 16564-th centered octagonal number.

It is an amenable number.

1097398129 is a deficient number, since it is larger than the sum of its proper divisors (12293402).

1097398129 is an frugal number, since it uses more digits than its factorization.

1097398129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 49.

The cubic root of 1097398129 is about 1031.4655760206.

Multiplying 1097398129 by its sum of digits (49), we get a square (53772508321 = 231889²).

The spelling of 1097398129 in words is "one billion, ninety-seven million, three hundred ninety-eight thousand, one hundred twenty-nine".