276648989 has 2 divisors, whose sum is σ = 276648990. Its totient is φ = 276648988.

The previous prime is 276648959. The next prime is 276649001. The reversal of 276648989 is 989846672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221265625 + 55383364 = 14875^2 + 7442^2 .

It is a cyclic number.

It is not a de Polignac number, because 276648989 - 2⁸ = 276648733 is a prime.

It is a super-2 number, since 2×276648989² = 153069326229444242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (276648959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138324494 + 138324495.

It is an arithmetic number, because the mean of its divisors is an integer number (138324495).

Almost surely, 2^276648989 is an apocalyptic number.

It is an amenable number.

276648989 is a deficient number, since it is larger than the sum of its proper divisors (1).

276648989 is an equidigital number, since it uses as much as digits as its factorization.

276648989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 59.

The square root of 276648989 is about 16632.7685308249. The cubic root of 276648989 is about 651.5929285887.

The spelling of 276648989 in words is "two hundred seventy-six million, six hundred forty-eight thousand, nine hundred eighty-nine".