812720357 has 2 divisors, whose sum is σ = 812720358. Its totient is φ = 812720356.

The previous prime is 812720299. The next prime is 812720369. The reversal of 812720357 is 753027218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 748624321 + 64096036 = 27361^2 + 8006^2 .

It is a cyclic number.

It is not a de Polignac number, because 812720357 - 2²⁰ = 811671781 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812723357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406360178 + 406360179.

It is an arithmetic number, because the mean of its divisors is an integer number (406360179).

Almost surely, 2^812720357 is an apocalyptic number.

It is an amenable number.

812720357 is a deficient number, since it is larger than the sum of its proper divisors (1).

812720357 is an equidigital number, since it uses as much as digits as its factorization.

812720357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 812720357 is about 28508.2506829163. The cubic root of 812720357 is about 933.2121390112.

The spelling of 812720357 in words is "eight hundred twelve million, seven hundred twenty thousand, three hundred fifty-seven".