7831261 has 2 divisors, whose sum is σ = 7831262. Its totient is φ = 7831260.

The previous prime is 7831259. The next prime is 7831267. The reversal of 7831261 is 1621387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6125625 + 1705636 = 2475^2 + 1306^2 .

It is a cyclic number.

It is not a de Polignac number, because 7831261 - 2¹ = 7831259 is a prime.

It is a super-2 number, since 2×7831261² = 122657297700242, which contains 22 as substring.

Together with 7831259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7831267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3915630 + 3915631.

It is an arithmetic number, because the mean of its divisors is an integer number (3915631).

Almost surely, 2^7831261 is an apocalyptic number.

7831261 is the 1252-nd centered decagonal number.

It is an amenable number.

7831261 is a deficient number, since it is larger than the sum of its proper divisors (1).

7831261 is an equidigital number, since it uses as much as digits as its factorization.

7831261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 28.

The square root of 7831261 is about 2798.4390291732. The cubic root of 7831261 is about 198.5838377570.

The spelling of 7831261 in words is "seven million, eight hundred thirty-one thousand, two hundred sixty-one".