1097199391 has 2 divisors, whose sum is σ = 1097199392. Its totient is φ = 1097199390.

The previous prime is 1097199373. The next prime is 1097199407. The reversal of 1097199391 is 1939917901.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1097199391 - 2⁷ = 1097199263 is a prime.

It is a super-2 number, since 2×1097199391² = 2407693007221541762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1097199331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 548599695 + 548599696.

It is an arithmetic number, because the mean of its divisors is an integer number (548599696).

Almost surely, 2^1097199391 is an apocalyptic number.

1097199391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1097199391 is an equidigital number, since it uses as much as digits as its factorization.

1097199391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 137781, while the sum is 49.

The square root of 1097199391 is about 33124.0002264219. Note that the first 3 decimals coincide. The cubic root of 1097199391 is about 1031.4033063738.

The spelling of 1097199391 in words is "one billion, ninety-seven million, one hundred ninety-nine thousand, three hundred ninety-one".