2191431 has 12 divisors (see below), whose sum is σ = 3212216. Its totient is φ = 1327920.

The previous prime is 2191429. The next prime is 2191433. The reversal of 2191431 is 1341912.

It is an interprime number because it is at equal distance from previous prime (2191429) and next prime (2191433).

It is not a de Polignac number, because 2191431 - 2¹ = 2191429 is a prime.

It is a super-2 number, since 2×2191431² = 9604739655522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a d-powerful number, because it can be written as 2⁷ + 1 + 9⁶ + 1 + 4⁸ + 3¹³ + 1 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2191398 and 2191407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2656 + ... + 3381.

2^2191431 is an apocalyptic number.

2191431 is a deficient number, since it is larger than the sum of its proper divisors (1020785).

2191431 is a wasteful number, since it uses less digits than its factorization.

2191431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6062 (or 6051 counting only the distinct ones).

The product of its digits is 216, while the sum is 21.

The square root of 2191431 is about 1480.3482698338. The cubic root of 2191431 is about 129.8900648499.

It can be divided in two parts, 21914 and 31, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 2191431 in words is "two million, one hundred ninety-one thousand, four hundred thirty-one".