1261051349 has 2 divisors, whose sum is σ = 1261051350. Its totient is φ = 1261051348.

The previous prime is 1261051307. The next prime is 1261051361. The reversal of 1261051349 is 9431501621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 879122500 + 381928849 = 29650^2 + 19543^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261051349 - 2¹² = 1261047253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261051369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630525674 + 630525675.

It is an arithmetic number, because the mean of its divisors is an integer number (630525675).

Almost surely, 2^1261051349 is an apocalyptic number.

It is an amenable number.

1261051349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261051349 is an equidigital number, since it uses as much as digits as its factorization.

1261051349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1261051349 is about 35511.2848120143. The cubic root of 1261051349 is about 1080.3826230586.

The spelling of 1261051349 in words is "one billion, two hundred sixty-one million, fifty-one thousand, three hundred forty-nine".