20120502191 has 2 divisors, whose sum is σ = 20120502192. Its totient is φ = 20120502190.

The previous prime is 20120502121. The next prime is 20120502203. The reversal of 20120502191 is 19120502102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20120502191 - 2¹⁴ = 20120485807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120502121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060251095 + 10060251096.

It is an arithmetic number, because the mean of its divisors is an integer number (10060251096).

Almost surely, 2^20120502191 is an apocalyptic number.

20120502191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120502191 is an equidigital number, since it uses as much as digits as its factorization.

20120502191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 23.

The spelling of 20120502191 in words is "twenty billion, one hundred twenty million, five hundred two thousand, one hundred ninety-one".