1220023291 has 2 divisors, whose sum is σ = 1220023292. Its totient is φ = 1220023290.

The previous prime is 1220023289. The next prime is 1220023319. The reversal of 1220023291 is 1923200221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220023291 - 2¹ = 1220023289 is a prime.

Together with 1220023289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1220023691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610011645 + 610011646.

It is an arithmetic number, because the mean of its divisors is an integer number (610011646).

Almost surely, 2^1220023291 is an apocalyptic number.

1220023291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220023291 is an equidigital number, since it uses as much as digits as its factorization.

1220023291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1220023291 is about 34928.8318012498. The cubic root of 1220023291 is about 1068.5365298668.

The spelling of 1220023291 in words is "one billion, two hundred twenty million, twenty-three thousand, two hundred ninety-one".