20120201989 has 2 divisors, whose sum is σ = 20120201990. Its totient is φ = 20120201988.

The previous prime is 20120201971. The next prime is 20120201999. The reversal of 20120201989 is 98910202102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11833741089 + 8286460900 = 108783^2 + 91030^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120201989 - 2⁵ = 20120201957 is a prime.

It is a super-3 number, since 3×20120201989³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120201999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060100994 + 10060100995.

It is an arithmetic number, because the mean of its divisors is an integer number (10060100995).

Almost surely, 2^20120201989 is an apocalyptic number.

It is an amenable number.

20120201989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120201989 is an equidigital number, since it uses as much as digits as its factorization.

20120201989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 34.

The spelling of 20120201989 in words is "twenty billion, one hundred twenty million, two hundred one thousand, nine hundred eighty-nine".