1891339201 has 4 divisors (see below), whose sum is σ = 1893482032. Its totient is φ = 1889196372.

The previous prime is 1891339159. The next prime is 1891339207. The reversal of 1891339201 is 1029331981.

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 1891339201 - 2²⁷ = 1757121473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1891339207) 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, 1070091 + ... + 1071856.

It is an arithmetic number, because the mean of its divisors is an integer number (473370508).

Almost surely, 2^1891339201 is an apocalyptic number.

It is an amenable number.

1891339201 is a deficient number, since it is larger than the sum of its proper divisors (2142831).

1891339201 is an equidigital number, since it uses as much as digits as its factorization.

1891339201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142830.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 1891339201 is about 43489.5297859151. The cubic root of 1891339201 is about 1236.6775437160.

The spelling of 1891339201 in words is "one billion, eight hundred ninety-one million, three hundred thirty-nine thousand, two hundred one".