1225132661 has 2 divisors, whose sum is σ = 1225132662. Its totient is φ = 1225132660.

The previous prime is 1225132639. The next prime is 1225132703. The reversal of 1225132661 is 1662315221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 763140625 + 461992036 = 27625^2 + 21494^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225132661 - 2²² = 1220938357 is a prime.

It is a super-3 number, since 3×1225132661³ (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 (1225132631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612566330 + 612566331.

It is an arithmetic number, because the mean of its divisors is an integer number (612566331).

Almost surely, 2^1225132661 is an apocalyptic number.

It is an amenable number.

1225132661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225132661 is an equidigital number, since it uses as much as digits as its factorization.

1225132661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 1225132661 is about 35001.8951058368. The cubic root of 1225132661 is about 1070.0261038264.

Adding to 1225132661 its reverse (1662315221), we get a palindrome (2887447882).

The spelling of 1225132661 in words is "one billion, two hundred twenty-five million, one hundred thirty-two thousand, six hundred sixty-one".