1245722861 has 2 divisors, whose sum is σ = 1245722862. Its totient is φ = 1245722860.

The previous prime is 1245722851. The next prime is 1245722867. The reversal of 1245722861 is 1682275421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 947469961 + 298252900 = 30781^2 + 17270^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245722861 - 2¹⁴ = 1245706477 is a prime.

It is a super-3 number, since 3×1245722861³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1245722867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622861430 + 622861431.

It is an arithmetic number, because the mean of its divisors is an integer number (622861431).

Almost surely, 2^1245722861 is an apocalyptic number.

It is an amenable number.

1245722861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245722861 is an equidigital number, since it uses as much as digits as its factorization.

1245722861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 38.

The square root of 1245722861 is about 35294.7993477793. The cubic root of 1245722861 is about 1075.9872987749.

The spelling of 1245722861 in words is "one billion, two hundred forty-five million, seven hundred twenty-two thousand, eight hundred sixty-one".