2197961387 has 2 divisors, whose sum is σ = 2197961388. Its totient is φ = 2197961386.

The previous prime is 2197961371. The next prime is 2197961407. The reversal of 2197961387 is 7831697912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2197961387 - 2⁴ = 2197961371 is a prime.

It is not a weakly prime, because it can be changed into another prime (2197961687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1098980693 + 1098980694.

It is an arithmetic number, because the mean of its divisors is an integer number (1098980694).

Almost surely, 2^2197961387 is an apocalyptic number.

2197961387 is a deficient number, since it is larger than the sum of its proper divisors (1).

2197961387 is an equidigital number, since it uses as much as digits as its factorization.

2197961387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 53.

The square root of 2197961387 is about 46882.4208739267. The cubic root of 2197961387 is about 1300.1895950301.

The spelling of 2197961387 in words is "two billion, one hundred ninety-seven million, nine hundred sixty-one thousand, three hundred eighty-seven".