1891319 has 2 divisors, whose sum is σ = 1891320. Its totient is φ = 1891318.

The previous prime is 1891303. The next prime is 1891333. The reversal of 1891319 is 9131981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1891319 - 2⁴ = 1891303 is a prime.

It is a super-2 number, since 2×1891319² = 7154175119522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1891619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945659 + 945660.

It is an arithmetic number, because the mean of its divisors is an integer number (945660).

2^1891319 is an apocalyptic number.

1891319 is a deficient number, since it is larger than the sum of its proper divisors (1).

1891319 is an equidigital number, since it uses as much as digits as its factorization.

1891319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 32.

The square root of 1891319 is about 1375.2523404816. The cubic root of 1891319 is about 123.6673140802.

The spelling of 1891319 in words is "one million, eight hundred ninety-one thousand, three hundred nineteen".