1245917081 has 2 divisors, whose sum is σ = 1245917082. Its totient is φ = 1245917080.

The previous prime is 1245917047. The next prime is 1245917089. The reversal of 1245917081 is 1807195421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1245454681 + 462400 = 35291^2 + 680^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245917081 - 2¹⁸ = 1245654937 is a prime.

It is a super-2 number, since 2×1245917081² = 3104618745455121122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1245917089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622958540 + 622958541.

It is an arithmetic number, because the mean of its divisors is an integer number (622958541).

Almost surely, 2^1245917081 is an apocalyptic number.

It is an amenable number.

1245917081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245917081 is an equidigital number, since it uses as much as digits as its factorization.

1245917081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 1245917081 is about 35297.5506374026. The cubic root of 1245917081 is about 1076.0432147415.

The spelling of 1245917081 in words is "one billion, two hundred forty-five million, nine hundred seventeen thousand, eighty-one".