813251 has 2 divisors, whose sum is σ = 813252. Its totient is φ = 813250.

The previous prime is 813227. The next prime is 813269. The reversal of 813251 is 152318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 813251 - 2¹⁴ = 796867 is a prime.

It is a super-2 number, since 2×813251² = 1322754378002, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (813221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406625 + 406626.

It is an arithmetic number, because the mean of its divisors is an integer number (406626).

2⁸¹³²⁵¹ is an apocalyptic number.

813251 is a deficient number, since it is larger than the sum of its proper divisors (1).

813251 is an equidigital number, since it uses as much as digits as its factorization.

813251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 20.

The square root of 813251 is about 901.8043024958. The cubic root of 813251 is about 93.3415199735.

Adding to 813251 its reverse (152318), we get a palindrome (965569).

The spelling of 813251 in words is "eight hundred thirteen thousand, two hundred fifty-one".