1225666901 has 4 divisors (see below), whose sum is σ = 1297764972. Its totient is φ = 1153568832.

The previous prime is 1225666889. The next prime is 1225666903. The reversal of 1225666901 is 1096665221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 601966225 + 623700676 = 24535^2 + 24974^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225666901 - 2⁶ = 1225666837 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225666903) 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 in 3 ways as a sum of consecutive naturals, for example, 36049010 + ... + 36049043.

It is an arithmetic number, because the mean of its divisors is an integer number (324441243).

Almost surely, 2^1225666901 is an apocalyptic number.

It is an amenable number.

1225666901 is a deficient number, since it is larger than the sum of its proper divisors (72098071).

1225666901 is an equidigital number, since it uses as much as digits as its factorization.

1225666901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72098070.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 1225666901 is about 35009.5258608282. The cubic root of 1225666901 is about 1070.1816156039.

The spelling of 1225666901 in words is "one billion, two hundred twenty-five million, six hundred sixty-six thousand, nine hundred one".