1912991 has 2 divisors, whose sum is σ = 1912992. Its totient is φ = 1912990.

The previous prime is 1912969. The next prime is 1913003. The reversal of 1912991 is 1992191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1912991 - 2¹⁴ = 1896607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1912921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 956495 + 956496.

It is an arithmetic number, because the mean of its divisors is an integer number (956496).

2^1912991 is an apocalyptic number.

1912991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1912991 is an equidigital number, since it uses as much as digits as its factorization.

1912991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458, while the sum is 32.

The square root of 1912991 is about 1383.1091786262. The cubic root of 1912991 is about 124.1378756022.

The spelling of 1912991 in words is "one million, nine hundred twelve thousand, nine hundred ninety-one".