1261100371 has 2 divisors, whose sum is σ = 1261100372. Its totient is φ = 1261100370.

The previous prime is 1261100359. The next prime is 1261100413. The reversal of 1261100371 is 1730011621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1261100371 - 2⁵ = 1261100339 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261100311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630550185 + 630550186.

It is an arithmetic number, because the mean of its divisors is an integer number (630550186).

Almost surely, 2^1261100371 is an apocalyptic number.

1261100371 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261100371 is an equidigital number, since it uses as much as digits as its factorization.

1261100371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 1261100371 is about 35511.9750365986. The cubic root of 1261100371 is about 1080.3966224438.

Adding to 1261100371 its reverse (1730011621), we get a palindrome (2991111992).

The spelling of 1261100371 in words is "one billion, two hundred sixty-one million, one hundred thousand, three hundred seventy-one".