1225403261 has 2 divisors, whose sum is σ = 1225403262. Its totient is φ = 1225403260.

The previous prime is 1225403243. The next prime is 1225403279. The reversal of 1225403261 is 1623045221.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1225403243) and next prime (1225403279).

It can be written as a sum of positive squares in only one way, i.e., 1217591236 + 7812025 = 34894^2 + 2795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225403261 - 2¹⁰ = 1225402237 is a prime.

It is a super-2 number, since 2×1225403261² = 3003226304138868242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1225403261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225403281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612701630 + 612701631.

It is an arithmetic number, because the mean of its divisors is an integer number (612701631).

Almost surely, 2^1225403261 is an apocalyptic number.

It is an amenable number.

1225403261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225403261 is an equidigital number, since it uses as much as digits as its factorization.

1225403261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1225403261 is about 35005.7603973975. The cubic root of 1225403261 is about 1070.1048783563.

Adding to 1225403261 its reverse (1623045221), we get a palindrome (2848448482).

The spelling of 1225403261 in words is "one billion, two hundred twenty-five million, four hundred three thousand, two hundred sixty-one".