1622720009 has 2 divisors, whose sum is σ = 1622720010. Its totient is φ = 1622720008.

The previous prime is 1622720003. The next prime is 1622720117. The reversal of 1622720009 is 9000272261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 876337609 + 746382400 = 29603^2 + 27320^2 .

It is a cyclic number.

It is not a de Polignac number, because 1622720009 - 2⁸ = 1622719753 is a prime.

It is a super-3 number, since 3×1622720009³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1622720003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811360004 + 811360005.

It is an arithmetic number, because the mean of its divisors is an integer number (811360005).

Almost surely, 2^1622720009 is an apocalyptic number.

It is an amenable number.

1622720009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1622720009 is an equidigital number, since it uses as much as digits as its factorization.

1622720009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 1622720009 is about 40282.9990070253. Note that the first 3 decimals coincide. The cubic root of 1622720009 is about 1175.1172380982.

The spelling of 1622720009 in words is "one billion, six hundred twenty-two million, seven hundred twenty thousand, nine".