20531154191 has 2 divisors, whose sum is σ = 20531154192. Its totient is φ = 20531154190.

The previous prime is 20531154173. The next prime is 20531154209. The reversal of 20531154191 is 19145113502.

It is a balanced prime because it is at equal distance from previous prime (20531154173) and next prime (20531154209).

It is a cyclic number.

It is not a de Polignac number, because 20531154191 - 2³⁰ = 19457412367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20531154131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265577095 + 10265577096.

It is an arithmetic number, because the mean of its divisors is an integer number (10265577096).

Almost surely, 2^20531154191 is an apocalyptic number.

20531154191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531154191 is an equidigital number, since it uses as much as digits as its factorization.

20531154191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 32.

Adding to 20531154191 its reverse (19145113502), we get a palindrome (39676267693).

The spelling of 20531154191 in words is "twenty billion, five hundred thirty-one million, one hundred fifty-four thousand, one hundred ninety-one".