1220654291 has 2 divisors, whose sum is σ = 1220654292. Its totient is φ = 1220654290.

The previous prime is 1220654231. The next prime is 1220654293. The reversal of 1220654291 is 1924560221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220654291 - 2¹⁴ = 1220637907 is a prime.

Together with 1220654293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1220654293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610327145 + 610327146.

It is an arithmetic number, because the mean of its divisors is an integer number (610327146).

Almost surely, 2^1220654291 is an apocalyptic number.

1220654291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220654291 is an equidigital number, since it uses as much as digits as its factorization.

1220654291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1220654291 is about 34937.8632861256. The cubic root of 1220654291 is about 1068.7207149688.

The spelling of 1220654291 in words is "one billion, two hundred twenty million, six hundred fifty-four thousand, two hundred ninety-one".