2158481197 has 2 divisors, whose sum is σ = 2158481198. Its totient is φ = 2158481196.

The previous prime is 2158481189. The next prime is 2158481243. The reversal of 2158481197 is 7911848512.

2158481197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (2158481243) can be obtained adding 2158481197 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2029862916 + 128618281 = 45054^2 + 11341^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158481197 - 2³ = 2158481189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2158481137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079240598 + 1079240599.

It is an arithmetic number, because the mean of its divisors is an integer number (1079240599).

Almost surely, 2^2158481197 is an apocalyptic number.

It is an amenable number.

2158481197 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158481197 is an equidigital number, since it uses as much as digits as its factorization.

2158481197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 46.

The square root of 2158481197 is about 46459.4575624813. The cubic root of 2158481197 is about 1292.3577650275.

The spelling of 2158481197 in words is "two billion, one hundred fifty-eight million, four hundred eighty-one thousand, one hundred ninety-seven".