1261149101 has 2 divisors, whose sum is σ = 1261149102. Its totient is φ = 1261149100.

The previous prime is 1261149091. The next prime is 1261149137. The reversal of 1261149101 is 1019411621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1260321001 + 828100 = 35501^2 + 910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261149101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261143101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630574550 + 630574551.

It is an arithmetic number, because the mean of its divisors is an integer number (630574551).

Almost surely, 2^1261149101 is an apocalyptic number.

It is an amenable number.

1261149101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261149101 is an equidigital number, since it uses as much as digits as its factorization.

1261149101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 1261149101 is about 35512.6611365580. The cubic root of 1261149101 is about 1080.4105380819.

The spelling of 1261149101 in words is "one billion, two hundred sixty-one million, one hundred forty-nine thousand, one hundred one".