1225820149 has 2 divisors, whose sum is σ = 1225820150. Its totient is φ = 1225820148.

The previous prime is 1225820143. The next prime is 1225820177. The reversal of 1225820149 is 9410285221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 656281924 + 569538225 = 25618^2 + 23865^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225820149 - 2⁵ = 1225820117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225820143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612910074 + 612910075.

It is an arithmetic number, because the mean of its divisors is an integer number (612910075).

Almost surely, 2^1225820149 is an apocalyptic number.

It is an amenable number.

1225820149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225820149 is an equidigital number, since it uses as much as digits as its factorization.

1225820149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 1225820149 is about 35011.7144538796. The cubic root of 1225820149 is about 1070.2262161821.

The spelling of 1225820149 in words is "one billion, two hundred twenty-five million, eight hundred twenty thousand, one hundred forty-nine".