831069257 has 2 divisors, whose sum is σ = 831069258. Its totient is φ = 831069256.

The previous prime is 831069229. The next prime is 831069341. The reversal of 831069257 is 752960138.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 747967801 + 83101456 = 27349^2 + 9116^2 .

It is a cyclic number.

It is not a de Polignac number, because 831069257 - 2¹⁰ = 831068233 is a prime.

It is a super-2 number, since 2×831069257² = 1381352219861064098, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (831069227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415534628 + 415534629.

It is an arithmetic number, because the mean of its divisors is an integer number (415534629).

Almost surely, 2^831069257 is an apocalyptic number.

It is an amenable number.

831069257 is a deficient number, since it is larger than the sum of its proper divisors (1).

831069257 is an equidigital number, since it uses as much as digits as its factorization.

831069257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 831069257 is about 28828.2718351274. The cubic root of 831069257 is about 940.1830249469.

The spelling of 831069257 in words is "eight hundred thirty-one million, sixty-nine thousand, two hundred fifty-seven".