2061297391 has 2 divisors, whose sum is σ = 2061297392. Its totient is φ = 2061297390.

The previous prime is 2061297389. The next prime is 2061297419. The reversal of 2061297391 is 1937921602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2061297391 - 2¹ = 2061297389 is a prime.

Together with 2061297389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2061217391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1030648695 + 1030648696.

It is an arithmetic number, because the mean of its divisors is an integer number (1030648696).

Almost surely, 2^2061297391 is an apocalyptic number.

2061297391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2061297391 is an equidigital number, since it uses as much as digits as its factorization.

2061297391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 2061297391 is about 45401.5130915259. The cubic root of 2061297391 is about 1272.6633900250.

The spelling of 2061297391 in words is "two billion, sixty-one million, two hundred ninety-seven thousand, three hundred ninety-one".