1891313 has 4 divisors (see below), whose sum is σ = 1973568. Its totient is φ = 1809060.

The previous prime is 1891303. The next prime is 1891319. The reversal of 1891313 is 3131981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1891313 - 2⁴ = 1891297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1891319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41093 + ... + 41138.

It is an arithmetic number, because the mean of its divisors is an integer number (493392).

2^1891313 is an apocalyptic number.

It is an amenable number.

1891313 is a deficient number, since it is larger than the sum of its proper divisors (82255).

1891313 is an equidigital number, since it uses as much as digits as its factorization.

1891313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82254.

The product of its digits is 648, while the sum is 26.

The square root of 1891313 is about 1375.2501590620. The cubic root of 1891313 is about 123.6671833064.

The spelling of 1891313 in words is "one million, eight hundred ninety-one thousand, three hundred thirteen".