1891131 has 16 divisors (see below), whose sum is σ = 2913408. Its totient is φ = 1078400.

The previous prime is 1891111. The next prime is 1891133. The reversal of 1891131 is 1311981.

It is a cyclic number.

It is not a de Polignac number, because 1891131 - 2¹⁰ = 1890107 is a prime.

It is a super-2 number, since 2×1891131² = 7152752918322, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1891133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1125 + ... + 2246.

It is an arithmetic number, because the mean of its divisors is an integer number (182088).

2^1891131 is an apocalyptic number.

1891131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1891131 is a deficient number, since it is larger than the sum of its proper divisors (1022277).

1891131 is a wasteful number, since it uses less digits than its factorization.

1891131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3402.

The product of its digits is 216, while the sum is 24.

The square root of 1891131 is about 1375.1839876904. The cubic root of 1891131 is about 123.6632163711.

The spelling of 1891131 in words is "one million, eight hundred ninety-one thousand, one hundred thirty-one".