501432121 has 2 divisors, whose sum is σ = 501432122. Its totient is φ = 501432120.

The previous prime is 501432101. The next prime is 501432137. The reversal of 501432121 is 121234105.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 365383225 + 136048896 = 19115^2 + 11664^2 .

It is a cyclic number.

It is not a de Polignac number, because 501432121 - 2⁵ = 501432089 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (501432101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250716060 + 250716061.

It is an arithmetic number, because the mean of its divisors is an integer number (250716061).

Almost surely, 2^501432121 is an apocalyptic number.

It is an amenable number.

501432121 is a deficient number, since it is larger than the sum of its proper divisors (1).

501432121 is an equidigital number, since it uses as much as digits as its factorization.

501432121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 501432121 is about 22392.6800763107. The cubic root of 501432121 is about 794.4575871021.

Adding to 501432121 its reverse (121234105), we get a palindrome (622666226).

The spelling of 501432121 in words is "five hundred one million, four hundred thirty-two thousand, one hundred twenty-one".