1209798797 has 2 divisors, whose sum is σ = 1209798798. Its totient is φ = 1209798796.

The previous prime is 1209798769. The next prime is 1209798803. The reversal of 1209798797 is 7978979021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1179647716 + 30151081 = 34346^2 + 5491^2 .

It is a cyclic number.

It is not a de Polignac number, because 1209798797 - 2²² = 1205604493 is a prime.

It is a super-2 number, since 2×1209798797² = 2927226258445294418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1209798697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604899398 + 604899399.

It is an arithmetic number, because the mean of its divisors is an integer number (604899399).

Almost surely, 2^1209798797 is an apocalyptic number.

It is an amenable number.

1209798797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209798797 is an equidigital number, since it uses as much as digits as its factorization.

1209798797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000752, while the sum is 59.

The square root of 1209798797 is about 34782.1620518334. The cubic root of 1209798797 is about 1065.5431694796.

The spelling of 1209798797 in words is "one billion, two hundred nine million, seven hundred ninety-eight thousand, seven hundred ninety-seven".