1377745961 has 2 divisors, whose sum is σ = 1377745962. Its totient is φ = 1377745960.

The previous prime is 1377745951. The next prime is 1377746047. The reversal of 1377745961 is 1695477731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 861774736 + 515971225 = 29356^2 + 22715^2 .

It is an emirp because it is prime and its reverse (1695477731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1377745961 - 2³⁰ = 304004137 is a prime.

It is not a weakly prime, because it can be changed into another prime (1377745951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688872980 + 688872981.

It is an arithmetic number, because the mean of its divisors is an integer number (688872981).

Almost surely, 2^1377745961 is an apocalyptic number.

It is an amenable number.

1377745961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377745961 is an equidigital number, since it uses as much as digits as its factorization.

1377745961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1111320, while the sum is 50.

The square root of 1377745961 is about 37118.0004984105. Note that the first 3 decimals coincide. The cubic root of 1377745961 is about 1112.7297909536.

The spelling of 1377745961 in words is "one billion, three hundred seventy-seven million, seven hundred forty-five thousand, nine hundred sixty-one".