1377778097 has 2 divisors, whose sum is σ = 1377778098. Its totient is φ = 1377778096.

The previous prime is 1377778057. The next prime is 1377778153. The reversal of 1377778097 is 7908777731.

It is an a-pointer prime, because the next prime (1377778153) can be obtained adding 1377778097 to its sum of digits (56).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1292474401 + 85303696 = 35951^2 + 9236^2 .

It is an emirp because it is prime and its reverse (7908777731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1377778097 - 2⁶ = 1377778033 is a prime.

It is not a weakly prime, because it can be changed into another prime (1377778037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688889048 + 688889049.

It is an arithmetic number, because the mean of its divisors is an integer number (688889049).

Almost surely, 2^1377778097 is an apocalyptic number.

It is an amenable number.

1377778097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377778097 is an equidigital number, since it uses as much as digits as its factorization.

1377778097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3630312, while the sum is 56.

The square root of 1377778097 is about 37118.4333855835. The cubic root of 1377778097 is about 1112.7384423808.

The spelling of 1377778097 in words is "one billion, three hundred seventy-seven million, seven hundred seventy-eight thousand, ninety-seven".