1512978191 has 2 divisors, whose sum is σ = 1512978192. Its totient is φ = 1512978190.

The previous prime is 1512978163. The next prime is 1512978193. The reversal of 1512978191 is 1918792151.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1512978191 - 2⁶ = 1512978127 is a prime.

Together with 1512978193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1512978193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 756489095 + 756489096.

It is an arithmetic number, because the mean of its divisors is an integer number (756489096).

Almost surely, 2^1512978191 is an apocalyptic number.

1512978191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1512978191 is an equidigital number, since it uses as much as digits as its factorization.

1512978191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 44.

The square root of 1512978191 is about 38897.0203357532. The cubic root of 1512978191 is about 1148.0061711295.

The spelling of 1512978191 in words is "one billion, five hundred twelve million, nine hundred seventy-eight thousand, one hundred ninety-one".