849881779 has 2 divisors, whose sum is σ = 849881780. Its totient is φ = 849881778.

The previous prime is 849881759. The next prime is 849881783. The reversal of 849881779 is 977188948.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 849881779 - 2⁷ = 849881651 is a prime.

It is not a weakly prime, because it can be changed into another prime (849881759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424940889 + 424940890.

It is an arithmetic number, because the mean of its divisors is an integer number (424940890).

Almost surely, 2^849881779 is an apocalyptic number.

849881779 is a deficient number, since it is larger than the sum of its proper divisors (1).

849881779 is an equidigital number, since it uses as much as digits as its factorization.

849881779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8128512, while the sum is 61.

The square root of 849881779 is about 29152.7319303011. The cubic root of 849881779 is about 947.2243186798.

The spelling of 849881779 in words is "eight hundred forty-nine million, eight hundred eighty-one thousand, seven hundred seventy-nine".