2130391 has 2 divisors, whose sum is σ = 2130392. Its totient is φ = 2130390.

The previous prime is 2130383. The next prime is 2130437. The reversal of 2130391 is 1930312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2130391 - 2³ = 2130383 is a prime.

2130391 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2130341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065195 + 1065196.

It is an arithmetic number, because the mean of its divisors is an integer number (1065196).

2^2130391 is an apocalyptic number.

2130391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2130391 is an equidigital number, since it uses as much as digits as its factorization.

2130391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 2130391 is about 1459.5859001785. The cubic root of 2130391 is about 128.6727075594.

The spelling of 2130391 in words is "two million, one hundred thirty thousand, three hundred ninety-one".