705021257 has 2 divisors, whose sum is σ = 705021258. Its totient is φ = 705021256.

The previous prime is 705021253. The next prime is 705021299. The reversal of 705021257 is 752120507.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 621554761 + 83466496 = 24931^2 + 9136^2 .

It is a cyclic number.

It is not a de Polignac number, because 705021257 - 2² = 705021253 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (705021253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352510628 + 352510629.

It is an arithmetic number, because the mean of its divisors is an integer number (352510629).

Almost surely, 2^705021257 is an apocalyptic number.

It is an amenable number.

705021257 is a deficient number, since it is larger than the sum of its proper divisors (1).

705021257 is an equidigital number, since it uses as much as digits as its factorization.

705021257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 705021257 is about 26552.2363841542. The cubic root of 705021257 is about 890.0219903669.

The spelling of 705021257 in words is "seven hundred five million, twenty-one thousand, two hundred fifty-seven".