1225906249 has 2 divisors, whose sum is σ = 1225906250. Its totient is φ = 1225906248.

The previous prime is 1225906229. The next prime is 1225906259. The reversal of 1225906249 is 9426095221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1213268224 + 12638025 = 34832^2 + 3555^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225906249 - 2²⁹ = 689035337 is a prime.

It is a super-2 number, since 2×1225906249² = 3005692262674500002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1225906229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612953124 + 612953125.

It is an arithmetic number, because the mean of its divisors is an integer number (612953125).

Almost surely, 2^1225906249 is an apocalyptic number.

It is an amenable number.

1225906249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225906249 is an equidigital number, since it uses as much as digits as its factorization.

1225906249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 1225906249 is about 35012.9440207475. The cubic root of 1225906249 is about 1070.2512726909.

The spelling of 1225906249 in words is "one billion, two hundred twenty-five million, nine hundred six thousand, two hundred forty-nine".