2154395197 has 2 divisors, whose sum is σ = 2154395198. Its totient is φ = 2154395196.

The previous prime is 2154395183. The next prime is 2154395233. The reversal of 2154395197 is 7915934512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2143597401 + 10797796 = 46299^2 + 3286^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154395197 - 2⁷ = 2154395069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2154395167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077197598 + 1077197599.

It is an arithmetic number, because the mean of its divisors is an integer number (1077197599).

Almost surely, 2^2154395197 is an apocalyptic number.

It is an amenable number.

2154395197 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154395197 is an equidigital number, since it uses as much as digits as its factorization.

2154395197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 340200, while the sum is 46.

The square root of 2154395197 is about 46415.4629083886. The cubic root of 2154395197 is about 1291.5417731498.

The spelling of 2154395197 in words is "two billion, one hundred fifty-four million, three hundred ninety-five thousand, one hundred ninety-seven".