1097361721 has 2 divisors, whose sum is σ = 1097361722. Its totient is φ = 1097361720.

The previous prime is 1097361689. The next prime is 1097361743. The reversal of 1097361721 is 1271637901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 776235321 + 321126400 = 27861^2 + 17920^2 .

It is a cyclic number.

It is not a de Polignac number, because 1097361721 - 2⁵ = 1097361689 is a prime.

It is not a weakly prime, because it can be changed into another prime (1097361791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 548680860 + 548680861.

It is an arithmetic number, because the mean of its divisors is an integer number (548680861).

Almost surely, 2^1097361721 is an apocalyptic number.

It is an amenable number.

1097361721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1097361721 is an equidigital number, since it uses as much as digits as its factorization.

1097361721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 1097361721 is about 33126.4504739038. The cubic root of 1097361721 is about 1031.4541690350.

The spelling of 1097361721 in words is "one billion, ninety-seven million, three hundred sixty-one thousand, seven hundred twenty-one".