1377958121 has 2 divisors, whose sum is σ = 1377958122. Its totient is φ = 1377958120.

The previous prime is 1377958063. The next prime is 1377958139. The reversal of 1377958121 is 1218597731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 739840000 + 638118121 = 27200^2 + 25261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1377958121 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1377958721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688979060 + 688979061.

It is an arithmetic number, because the mean of its divisors is an integer number (688979061).

Almost surely, 2^1377958121 is an apocalyptic number.

It is an amenable number.

1377958121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377958121 is an equidigital number, since it uses as much as digits as its factorization.

1377958121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 44.

The square root of 1377958121 is about 37120.8583009607. The cubic root of 1377958121 is about 1112.7869046844.

The spelling of 1377958121 in words is "one billion, three hundred seventy-seven million, nine hundred fifty-eight thousand, one hundred twenty-one".