1967902991 has 2 divisors, whose sum is σ = 1967902992. Its totient is φ = 1967902990.

The previous prime is 1967902969. The next prime is 1967902999. The reversal of 1967902991 is 1992097691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1967902991 - 2⁶ = 1967902927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1967902999) 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, 983951495 + 983951496.

It is an arithmetic number, because the mean of its divisors is an integer number (983951496).

Almost surely, 2^1967902991 is an apocalyptic number.

1967902991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1967902991 is an equidigital number, since it uses as much as digits as its factorization.

1967902991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 551124, while the sum is 53.

The square root of 1967902991 is about 44361.0526362935. The cubic root of 1967902991 is about 1253.1447200343.

The spelling of 1967902991 in words is "one billion, nine hundred sixty-seven million, nine hundred two thousand, nine hundred ninety-one".