802761991 has 2 divisors, whose sum is σ = 802761992. Its totient is φ = 802761990.

The previous prime is 802761983. The next prime is 802762003. The reversal of 802761991 is 199167208.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 802761991 - 2³ = 802761983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (802761931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401380995 + 401380996.

It is an arithmetic number, because the mean of its divisors is an integer number (401380996).

Almost surely, 2^802761991 is an apocalyptic number.

802761991 is a deficient number, since it is larger than the sum of its proper divisors (1).

802761991 is an equidigital number, since it uses as much as digits as its factorization.

802761991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 802761991 is about 28333.0547417676. The cubic root of 802761991 is about 929.3848751519.

The spelling of 802761991 in words is "eight hundred two million, seven hundred sixty-one thousand, nine hundred ninety-one".