1376756989 has 2 divisors, whose sum is σ = 1376756990. Its totient is φ = 1376756988.

The previous prime is 1376756921. The next prime is 1376756993. The reversal of 1376756989 is 9896576731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1354976100 + 21780889 = 36810^2 + 4667^2 .

It is a cyclic number.

It is not a de Polignac number, because 1376756989 - 2⁷ = 1376756861 is a prime.

It is a super-2 number, since 2×1376756989² = 3790919613520692242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1376756189) 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, 688378494 + 688378495.

It is an arithmetic number, because the mean of its divisors is an integer number (688378495).

Almost surely, 2^1376756989 is an apocalyptic number.

It is an amenable number.

1376756989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1376756989 is an equidigital number, since it uses as much as digits as its factorization.

1376756989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17146080, while the sum is 61.

The square root of 1376756989 is about 37104.6761069275. The cubic root of 1376756989 is about 1112.4634810888.

It can be divided in two parts, 13767 and 56989, that added together give a square (70756 = 266²).

The spelling of 1376756989 in words is "one billion, three hundred seventy-six million, seven hundred fifty-six thousand, nine hundred eighty-nine".