1221294677 has 2 divisors, whose sum is σ = 1221294678. Its totient is φ = 1221294676.

The previous prime is 1221294653. The next prime is 1221294689. The reversal of 1221294677 is 7764921221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1073283121 + 148011556 = 32761^2 + 12166^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221294677 - 2²² = 1217100373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221294617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610647338 + 610647339.

It is an arithmetic number, because the mean of its divisors is an integer number (610647339).

Almost surely, 2^1221294677 is an apocalyptic number.

It is an amenable number.

1221294677 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221294677 is an equidigital number, since it uses as much as digits as its factorization.

1221294677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 1221294677 is about 34947.0267261751. The cubic root of 1221294677 is about 1068.9075749013.

The spelling of 1221294677 in words is "one billion, two hundred twenty-one million, two hundred ninety-four thousand, six hundred seventy-seven".