1226664973 has 2 divisors, whose sum is σ = 1226664974. Its totient is φ = 1226664972.

The previous prime is 1226664949. The next prime is 1226664979. The reversal of 1226664973 is 3794666221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1165403044 + 61261929 = 34138^2 + 7827^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1226664973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1226664979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613332486 + 613332487.

It is an arithmetic number, because the mean of its divisors is an integer number (613332487).

Almost surely, 2^1226664973 is an apocalyptic number.

It is an amenable number.

1226664973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226664973 is an equidigital number, since it uses as much as digits as its factorization.

1226664973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 46.

The square root of 1226664973 is about 35023.7772520327. Note that the first 3 decimals coincide. The cubic root of 1226664973 is about 1070.4720230845.

The spelling of 1226664973 in words is "one billion, two hundred twenty-six million, six hundred sixty-four thousand, nine hundred seventy-three".