1249911161 has 2 divisors, whose sum is σ = 1249911162. Its totient is φ = 1249911160.

The previous prime is 1249911139. The next prime is 1249911211. The reversal of 1249911161 is 1611199421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1110222400 + 139688761 = 33320^2 + 11819^2 .

It is a cyclic number.

It is not a de Polignac number, because 1249911161 - 2¹⁴ = 1249894777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1249901161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624955580 + 624955581.

It is an arithmetic number, because the mean of its divisors is an integer number (624955581).

Almost surely, 2^1249911161 is an apocalyptic number.

It is an amenable number.

1249911161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249911161 is an equidigital number, since it uses as much as digits as its factorization.

1249911161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 35.

The square root of 1249911161 is about 35354.0826638169. The cubic root of 1249911161 is about 1077.1918247016.

The spelling of 1249911161 in words is "one billion, two hundred forty-nine million, nine hundred eleven thousand, one hundred sixty-one".