1621022089 has 2 divisors, whose sum is σ = 1621022090. Its totient is φ = 1621022088.

The previous prime is 1621022033. The next prime is 1621022101. The reversal of 1621022089 is 9802201261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1560882064 + 60140025 = 39508^2 + 7755^2 .

It is an emirp because it is prime and its reverse (9802201261) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1621022089 is a prime.

It is a super-2 number, since 2×1621022089² = 5255425226051847842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1621022089.

It is not a weakly prime, because it can be changed into another prime (1621022489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810511044 + 810511045.

It is an arithmetic number, because the mean of its divisors is an integer number (810511045).

Almost surely, 2^1621022089 is an apocalyptic number.

It is an amenable number.

1621022089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621022089 is an equidigital number, since it uses as much as digits as its factorization.

1621022089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1621022089 is about 40261.9185956159. The cubic root of 1621022089 is about 1174.7072369148.

The spelling of 1621022089 in words is "one billion, six hundred twenty-one million, twenty-two thousand, eighty-nine".