1377565121 has 2 divisors, whose sum is σ = 1377565122. Its totient is φ = 1377565120.

The previous prime is 1377565081. The next prime is 1377565237. The reversal of 1377565121 is 1215657731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1269924496 + 107640625 = 35636^2 + 10375^2 .

It is an emirp because it is prime and its reverse (1215657731) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1377565121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1377564121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688782560 + 688782561.

It is an arithmetic number, because the mean of its divisors is an integer number (688782561).

Almost surely, 2^1377565121 is an apocalyptic number.

It is an amenable number.

1377565121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377565121 is an equidigital number, since it uses as much as digits as its factorization.

1377565121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44100, while the sum is 38.

The square root of 1377565121 is about 37115.5644036299. The cubic root of 1377565121 is about 1112.6811039760.

The spelling of 1377565121 in words is "one billion, three hundred seventy-seven million, five hundred sixty-five thousand, one hundred twenty-one".