1261160377 has 2 divisors, whose sum is σ = 1261160378. Its totient is φ = 1261160376.

The previous prime is 1261160347. The next prime is 1261160389. The reversal of 1261160377 is 7730611621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 730134441 + 531025936 = 27021^2 + 23044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261160377 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261160347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630580188 + 630580189.

It is an arithmetic number, because the mean of its divisors is an integer number (630580189).

Almost surely, 2^1261160377 is an apocalyptic number.

It is an amenable number.

1261160377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261160377 is an equidigital number, since it uses as much as digits as its factorization.

1261160377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 1261160377 is about 35512.8198964825. The cubic root of 1261160377 is about 1080.4137580747.

Adding to 1261160377 its reverse (7730611621), we get a palindrome (8991771998).

The spelling of 1261160377 in words is "one billion, two hundred sixty-one million, one hundred sixty thousand, three hundred seventy-seven".