1377416561 has 2 divisors, whose sum is σ = 1377416562. Its totient is φ = 1377416560.

The previous prime is 1377416531. The next prime is 1377416569. The reversal of 1377416561 is 1656147731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1357480336 + 19936225 = 36844^2 + 4465^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377416561 - 2¹⁰ = 1377415537 is a prime.

It is not a weakly prime, because it can be changed into another prime (1377416569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688708280 + 688708281.

It is an arithmetic number, because the mean of its divisors is an integer number (688708281).

Almost surely, 2^1377416561 is an apocalyptic number.

It is an amenable number.

1377416561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377416561 is an equidigital number, since it uses as much as digits as its factorization.

1377416561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 41.

The square root of 1377416561 is about 37113.5630329399. The cubic root of 1377416561 is about 1112.6411044521.

The spelling of 1377416561 in words is "one billion, three hundred seventy-seven million, four hundred sixteen thousand, five hundred sixty-one".