20153012309 has 2 divisors, whose sum is σ = 20153012310. Its totient is φ = 20153012308.

The previous prime is 20153012303. The next prime is 20153012351. The reversal of 20153012309 is 90321035102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13871657284 + 6281355025 = 117778^2 + 79255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20153012309 is a prime.

It is a super-2 number, since 2×20153012309² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20153012303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10076506154 + 10076506155.

It is an arithmetic number, because the mean of its divisors is an integer number (10076506155).

Almost surely, 2^20153012309 is an apocalyptic number.

It is an amenable number.

20153012309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20153012309 is an equidigital number, since it uses as much as digits as its factorization.

20153012309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 26.

The spelling of 20153012309 in words is "twenty billion, one hundred fifty-three million, twelve thousand, three hundred nine".