1311201377 has 2 divisors, whose sum is σ = 1311201378. Its totient is φ = 1311201376.

The previous prime is 1311201373. The next prime is 1311201391. The reversal of 1311201377 is 7731021131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1023424081 + 287777296 = 31991^2 + 16964^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311201377 - 2² = 1311201373 is a prime.

It is a super-2 number, since 2×1311201377² = 3438498102093392258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1311201371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655600688 + 655600689.

It is an arithmetic number, because the mean of its divisors is an integer number (655600689).

Almost surely, 2^1311201377 is an apocalyptic number.

It is an amenable number.

1311201377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311201377 is an equidigital number, since it uses as much as digits as its factorization.

1311201377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 1311201377 is about 36210.5147298406. The cubic root of 1311201377 is about 1094.5185645876.

The spelling of 1311201377 in words is "one billion, three hundred eleven million, two hundred one thousand, three hundred seventy-seven".