1377107521 has 2 divisors, whose sum is σ = 1377107522. Its totient is φ = 1377107520.

The previous prime is 1377107519. The next prime is 1377107527. The reversal of 1377107521 is 1257017731.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1367890225 + 9217296 = 36985^2 + 3036^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377107521 - 2¹ = 1377107519 is a prime.

Together with 1377107519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1377107527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688553760 + 688553761.

It is an arithmetic number, because the mean of its divisors is an integer number (688553761).

Almost surely, 2^1377107521 is an apocalyptic number.

It is an amenable number.

1377107521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377107521 is an equidigital number, since it uses as much as digits as its factorization.

1377107521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10290, while the sum is 34.

The square root of 1377107521 is about 37109.3993618867. The cubic root of 1377107521 is about 1112.5578867493.

The spelling of 1377107521 in words is "one billion, three hundred seventy-seven million, one hundred seven thousand, five hundred twenty-one".