1969812197 has 2 divisors, whose sum is σ = 1969812198. Its totient is φ = 1969812196.

The previous prime is 1969812133. The next prime is 1969812203. The reversal of 1969812197 is 7912189691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1757789476 + 212022721 = 41926^2 + 14561^2 .

It is a cyclic number.

It is not a de Polignac number, because 1969812197 - 2⁶ = 1969812133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1969812997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984906098 + 984906099.

It is an arithmetic number, because the mean of its divisors is an integer number (984906099).

Almost surely, 2^1969812197 is an apocalyptic number.

It is an amenable number.

1969812197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1969812197 is an equidigital number, since it uses as much as digits as its factorization.

1969812197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 53.

The square root of 1969812197 is about 44382.5663633819. The cubic root of 1969812197 is about 1253.5498446990.

The spelling of 1969812197 in words is "one billion, nine hundred sixty-nine million, eight hundred twelve thousand, one hundred ninety-seven".