6431261 has 2 divisors, whose sum is σ = 6431262. Its totient is φ = 6431260.

The previous prime is 6431239. The next prime is 6431273. The reversal of 6431261 is 1621346.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6175225 + 256036 = 2485^2 + 506^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6431261 is a prime.

It is a super-2 number, since 2×6431261² = 82722236100242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6431221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3215630 + 3215631.

It is an arithmetic number, because the mean of its divisors is an integer number (3215631).

Almost surely, 2^6431261 is an apocalyptic number.

It is an amenable number.

6431261 is a deficient number, since it is larger than the sum of its proper divisors (1).

6431261 is an equidigital number, since it uses as much as digits as its factorization.

6431261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 6431261 is about 2535.9930993597. The cubic root of 6431261 is about 185.9653556318.

The spelling of 6431261 in words is "six million, four hundred thirty-one thousand, two hundred sixty-one".