1222029391 has 4 divisors (see below), whose sum is σ = 1333122984. Its totient is φ = 1110935800.

The previous prime is 1222029373. The next prime is 1222029397. The reversal of 1222029391 is 1939202221.

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

It is a cyclic number.

It is not a de Polignac number, because 1222029391 - 2¹⁵ = 1221996623 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222029397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55546780 + ... + 55546801.

It is an arithmetic number, because the mean of its divisors is an integer number (333280746).

Almost surely, 2^1222029391 is an apocalyptic number.

1222029391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1222029391 is a deficient number, since it is larger than the sum of its proper divisors (111093593).

1222029391 is a wasteful number, since it uses less digits than its factorization.

1222029391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111093592.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 1222029391 is about 34957.5369698725. The cubic root of 1222029391 is about 1069.1218786081.

The spelling of 1222029391 in words is "one billion, two hundred twenty-two million, twenty-nine thousand, three hundred ninety-one".