2171431 has 2 divisors, whose sum is σ = 2171432. Its totient is φ = 2171430.

The previous prime is 2171387. The next prime is 2171437. The reversal of 2171431 is 1341712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2171431 - 2⁹ = 2170919 is a prime.

It is a super-2 number, since 2×2171431² = 9430225175522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2171399 and 2171408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2171437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085715 + 1085716.

It is an arithmetic number, because the mean of its divisors is an integer number (1085716).

2^2171431 is an apocalyptic number.

2171431 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171431 is an equidigital number, since it uses as much as digits as its factorization.

2171431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168, while the sum is 19.

The square root of 2171431 is about 1473.5776192654. The cubic root of 2171431 is about 129.4937112771.

It can be divided in two parts, 21 and 71431, that multiplied together give a palindrome (1500051).

The spelling of 2171431 in words is "two million, one hundred seventy-one thousand, four hundred thirty-one".