20531044151 has 2 divisors, whose sum is σ = 20531044152. Its totient is φ = 20531044150.

The previous prime is 20531044147. The next prime is 20531044199. The reversal of 20531044151 is 15144013502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20531044151 - 2² = 20531044147 is a prime.

It is a super-2 number, since 2×20531044151² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20531044151.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20531044951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265522075 + 10265522076.

It is an arithmetic number, because the mean of its divisors is an integer number (10265522076).

Almost surely, 2^20531044151 is an apocalyptic number.

20531044151 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531044151 is an equidigital number, since it uses as much as digits as its factorization.

20531044151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 20531044151 its reverse (15144013502), we get a palindrome (35675057653).

The spelling of 20531044151 in words is "twenty billion, five hundred thirty-one million, forty-four thousand, one hundred fifty-one".