771672989 has 2 divisors, whose sum is σ = 771672990. Its totient is φ = 771672988.

The previous prime is 771672961. The next prime is 771673003. The reversal of 771672989 is 989276177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 745836100 + 25836889 = 27310^2 + 5083^2 .

It is a cyclic number.

It is not a de Polignac number, because 771672989 - 2²⁴ = 754895773 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 (771672929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385836494 + 385836495.

It is an arithmetic number, because the mean of its divisors is an integer number (385836495).

Almost surely, 2^771672989 is an apocalyptic number.

It is an amenable number.

771672989 is a deficient number, since it is larger than the sum of its proper divisors (1).

771672989 is an equidigital number, since it uses as much as digits as its factorization.

771672989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2667168, while the sum is 56.

The square root of 771672989 is about 27779.0026638827. The cubic root of 771672989 is about 917.2289766157.

The spelling of 771672989 in words is "seven hundred seventy-one million, six hundred seventy-two thousand, nine hundred eighty-nine".