802991857 has 2 divisors, whose sum is σ = 802991858. Its totient is φ = 802991856.

The previous prime is 802991831. The next prime is 802991867. The reversal of 802991857 is 758199208.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 797441121 + 5550736 = 28239^2 + 2356^2 .

It is a cyclic number.

It is not a de Polignac number, because 802991857 - 2¹⁹ = 802467569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 802991857.

It is not a weakly prime, because it can be changed into another prime (802991807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401495928 + 401495929.

It is an arithmetic number, because the mean of its divisors is an integer number (401495929).

Almost surely, 2^802991857 is an apocalyptic number.

It is an amenable number.

802991857 is a deficient number, since it is larger than the sum of its proper divisors (1).

802991857 is an equidigital number, since it uses as much as digits as its factorization.

802991857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 49.

The square root of 802991857 is about 28337.1109501304. The cubic root of 802991857 is about 929.4735745831.

The spelling of 802991857 in words is "eight hundred two million, nine hundred ninety-one thousand, eight hundred fifty-seven".