2115243391 has 2 divisors, whose sum is σ = 2115243392. Its totient is φ = 2115243390.

The previous prime is 2115243373. The next prime is 2115243451. The reversal of 2115243391 is 1933425112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2115243391 - 2¹¹ = 2115241343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2115243301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1057621695 + 1057621696.

It is an arithmetic number, because the mean of its divisors is an integer number (1057621696).

Almost surely, 2^2115243391 is an apocalyptic number.

2115243391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2115243391 is an equidigital number, since it uses as much as digits as its factorization.

2115243391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 31.

The square root of 2115243391 is about 45991.7752538429. The cubic root of 2115243391 is about 1283.6701693144.

The spelling of 2115243391 in words is "two billion, one hundred fifteen million, two hundred forty-three thousand, three hundred ninety-one".