20154043531 has 2 divisors, whose sum is σ = 20154043532. Its totient is φ = 20154043530.

The previous prime is 20154043501. The next prime is 20154043573. The reversal of 20154043531 is 13534045102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20154043531 - 2¹¹ = 20154041483 is a prime.

It is a super-2 number, since 2×20154043531² (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 20154043531.

It is not a weakly prime, because it can be changed into another prime (20154043501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10077021765 + 10077021766.

It is an arithmetic number, because the mean of its divisors is an integer number (10077021766).

Almost surely, 2^20154043531 is an apocalyptic number.

20154043531 is a deficient number, since it is larger than the sum of its proper divisors (1).

20154043531 is an equidigital number, since it uses as much as digits as its factorization.

20154043531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 20154043531 its reverse (13534045102), we get a palindrome (33688088633).

The spelling of 20154043531 in words is "twenty billion, one hundred fifty-four million, forty-three thousand, five hundred thirty-one".